Tag 3.9.17

Built from https://develop.svn.wordpress.org/tags/3.9.17@40221 git-svn-id: http://core.svn.wordpress.org/tags/3.9.17@40160 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Bump 3.9 branch to version 3.9.17.
2017-03-06 18:16:07 +00:00 · 2017-03-06 16:42:15 +00:00 · 2017-03-06 13:45:58 +00:00 · 2017-03-06 13:05:15 +00:00 · 2017-03-06 08:12:16 +00:00 · 2017-01-26 18:29:15 +00:00
67 changed files with 4473 additions and 1486 deletions
--- a/license.txt
+++ b/license.txt
@@ -1,6 +1,6 @@
 WordPress - Web publishing software

-Copyright 2014 by the contributors
+Copyright 2017 by the contributors

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
--- a/readme.html
+++ b/readme.html
@@ -9,7 +9,7 @@
 <body>
 <h1 id="logo">
 	<a href="https://wordpress.org/"><img alt="WordPress" src="wp-admin/images/wordpress-logo.png" /></a>
-	<br /> Version 3.9.1
+	<br /> Version 3.9.17
 </h1>
 <p style="text-align: center">Semantic Personal Publishing Platform</p>

--- a/wp-admin/about.php
+++ b/wp-admin/about.php
@@ -39,10 +39,74 @@ include( ABSPATH . 'wp-admin/admin-header.php' );
 </h2>

 <div class="changelog point-releases">
-	<h3><?php echo _n( 'Maintenance Release', 'Maintenance Releases', 1 ); ?></h3>
+	<h3><?php echo _n( 'Maintenance and Security Release', 'Maintenance and Security Releases', 17 ); ?></h3>
+	<p><?php printf( _n( '<strong>Version %1$s</strong> addressed a security issue.',
+         '<strong>Version %1$s</strong> addressed some security issues.', 5 ), '3.9.17' ); ?>
+		<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_3.9.17' ); ?>
+	</p>
+	<p><?php printf( _n( '<strong>Version %1$s</strong> addressed a security issue.',
+         '<strong>Version %1$s</strong> addressed some security issues.', 3 ), '3.9.16' ); ?>
+		<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_3.9.16' ); ?>
+	</p>
+	<p><?php printf( _n( '<strong>Version %1$s</strong> addressed a security issue.',
+         '<strong>Version %1$s</strong> addressed some security issues.', 8 ), '3.9.15' ); ?>
+		<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_3.9.15' ); ?>
+	</p>
+	<p><?php printf( _n( '<strong>Version %1$s</strong> addressed a security issue.',
+         '<strong>Version %1$s</strong> addressed some security issues.', 2 ), '3.9.14' ); ?>
+		<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_3.9.14' ); ?>
+	</p>
+	<p><?php printf( _n( '<strong>Version %1$s</strong> addressed a security issue.',
+         '<strong>Version %1$s</strong> addressed some security issues.', 9 ), '3.9.13' ); ?>
+		<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_3.9.13' ); ?>
+	</p>
+	<p><?php printf( _n( '<strong>Version %1$s</strong> addressed a security issue.',
+         '<strong>Version %1$s</strong> addressed some security issues.', 6 ), '3.9.12' ); ?>
+		<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_3.9.12' ); ?>
+ 	</p>
+	<p><?php printf( _n( '<strong>Version %1$s</strong> addressed a security issue.',
+         '<strong>Version %1$s</strong> addressed some security issues.', 2 ), '3.9.11' ); ?>
+		<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_3.9.11' ); ?>
+ 	</p>
+	<p><?php printf( _n( '<strong>Version %1$s</strong> addressed a security issue.',
+         '<strong>Version %1$s</strong> addressed some security issues.', 1 ), '3.9.10' ); ?>
+		<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_3.9.10' ); ?>
+ 	</p>
+	<p><?php printf( _n( '<strong>Version %1$s</strong> addressed some security issues and fixed %2$s bug.',
+         '<strong>Version %1$s</strong> addressed some security issues and fixed %2$s bugs.', 2 ), '3.9.9', number_format_i18n( 2 ) ); ?>
+		<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_3.9.9' ); ?>
+	</p>
+	<p><?php printf( _n( '<strong>Version %1$s</strong> addressed some security issues and fixed %2$s bug.',
+         '<strong>Version %1$s</strong> addressed some security issues and fixed %2$s bugs.', 2 ), '3.9.8', number_format_i18n( 2 ) ); ?>
+		<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_3.9.8' ); ?>
+	</p>
+	<p><?php printf( _n( '<strong>Version %1$s</strong> addressed a security issue.',
+         '<strong>Version %1$s</strong> addressed some security issues.', 2 ), '3.9.7' ); ?>
+		<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_3.9.7' ); ?>
+ 	</p>
+	<p><?php printf( _n( '<strong>Version %1$s</strong> addressed some security issues and fixed %2$s bug.',
+         '<strong>Version %1$s</strong> addressed some security issues and fixed %2$s bugs.', 3 ), '3.9.6', number_format_i18n( 3 ) ); ?>
+		<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_3.9.6' ); ?>
+	</p>
+	<p><?php printf( _n( '<strong>Version %1$s</strong> addressed %2$s bug.',
+         '<strong>Version %1$s</strong> addressed %2$s bugs.', 1 ), '3.9.5', number_format_i18n( 1 ) ); ?>
+		<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_3.9.5' ); ?>
+ 	</p>
+	<p><?php printf( _n( '<strong>Version %1$s</strong> addressed a security issue.',
+         '<strong>Version %1$s</strong> addressed some security issues.', 8 ), '3.9.4' ); ?>
+		<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_3.9.4' ); ?>
+ 	</p>
+	<p><?php printf( _n( '<strong>Version %1$s</strong> addressed a security issue.',
+         '<strong>Version %1$s</strong> addressed some security issues.', 9 ), '3.9.3', number_format_i18n( 9 ) ); ?>
+		<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_3.9.3' ); ?>
+ 	</p>
+	<p><?php printf( _n( '<strong>Version %1$s</strong> addressed a security issue.',
+         '<strong>Version %1$s</strong> addressed some security issues.', 6 ), '3.9.2', number_format_i18n( 6 ) ); ?>
+		<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_3.9.2' ); ?>
+ 	</p>
 	<p><?php printf( _n( '<strong>Version %1$s</strong> addressed %2$s bug.',
         '<strong>Version %1$s</strong> addressed %2$s bugs.', 34 ), '3.9.1', number_format_i18n( 34 ) ); ?>
-		<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'http://codex.wordpress.org/Version_3.9.1' ); ?>
+		<?php printf( __( 'For more information, see <a href="%s">the release notes</a>.' ), 'https://codex.wordpress.org/Version_3.9.1' ); ?>
 	</p>
 </div>

--- a/wp-admin/customize.php
+++ b/wp-admin/customize.php
@@ -17,9 +17,10 @@ if ( ! current_user_can( 'edit_theme_options' ) )

 wp_reset_vars( array( 'url', 'return' ) );
 $url = urldecode( $url );
+$url = esc_url_raw( $url );
 $url = wp_validate_redirect( $url, home_url( '/' ) );
 if ( $return )
-	$return = wp_validate_redirect( urldecode( $return ) );
+	$return = wp_validate_redirect( esc_url_raw( urldecode( $return ) ) );
 if ( ! $return )
 	$return = $url;

--- a/wp-admin/includes/ajax-actions.php
+++ b/wp-admin/includes/ajax-actions.php
@@ -1323,11 +1323,13 @@ function wp_ajax_inline_save() {
 	if ( isset($data['post_parent']) )
 		$data['parent_id'] = $data['post_parent'];

-	// status
-	if ( isset($data['keep_private']) && 'private' == $data['keep_private'] )
+	// Status.
+	if ( isset( $data['keep_private'] ) && 'private' == $data['keep_private'] ) {
+		$data['visibility']  = 'private';
 		$data['post_status'] = 'private';
-	else
+	} else {
 		$data['post_status'] = $data['_status'];
+	}

 	if ( empty($data['comment_status']) )
 		$data['comment_status'] = 'closed';
@@ -2164,7 +2166,7 @@ function wp_ajax_get_revision_diffs() {
 	if ( ! $post = get_post( (int) $_REQUEST['post_id'] ) )
 		wp_send_json_error();

-	if ( ! current_user_can( 'read_post', $post->ID ) )
+	if ( ! current_user_can( 'edit_post', $post->ID ) )
 		wp_send_json_error();

 	// Really just pre-loading the cache here.
--- a/wp-admin/includes/class-wp-comments-list-table.php
+++ b/wp-admin/includes/class-wp-comments-list-table.php
@@ -537,9 +537,9 @@ class WP_Comments_List_Table extends WP_List_Table {

 		if ( current_user_can( 'edit_post', $post->ID ) ) {
 			$post_link = "<a href='" . get_edit_post_link( $post->ID ) . "'>";
-			$post_link .= get_the_title( $post->ID ) . '</a>';
+			$post_link .= esc_html( get_the_title( $post->ID ) ) . '</a>';
 		} else {
-			$post_link = get_the_title( $post->ID );
+			$post_link = esc_html( get_the_title( $post->ID ) );
 		}

 		echo '<div class="response-links"><span class="post-com-count-wrapper">';
--- a/wp-admin/includes/class-wp-ms-users-list-table.php
+++ b/wp-admin/includes/class-wp-ms-users-list-table.php
@@ -219,7 +219,7 @@ class WP_MS_Users_List_Table extends WP_List_Table {
 					break;

 					case 'email':
-						echo "<td $attributes><a href='mailto:$user->user_email'>$user->user_email</a></td>";
+						echo "<td $attributes><a href='" . esc_url( "mailto:$user->user_email" ) . "'>$user->user_email</a></td>";
 					break;

 					case 'registered':
--- a/wp-admin/includes/class-wp-posts-list-table.php
+++ b/wp-admin/includes/class-wp-posts-list-table.php
@@ -638,8 +638,9 @@ class WP_Posts_List_Table extends WP_List_Table {
 					echo '<div class="locked-info"><span class="locked-avatar">' . $locked_avatar . '</span> <span class="locked-text">' . $locked_text . "</span></div>\n";
 				}

-				if ( ! $this->hierarchical_display && 'excerpt' == $mode && current_user_can( 'read_post', $post->ID ) )
-						the_excerpt();
+				if ( ! $this->hierarchical_display && 'excerpt' == $mode && current_user_can( 'read_post', $post->ID ) ) {
+						echo esc_html( get_the_excerpt() );
+				}

 				$actions = array();
 				if ( $can_edit_post && 'trash' != $post->post_status ) {
--- a/wp-admin/includes/class-wp-upgrader.php
+++ b/wp-admin/includes/class-wp-upgrader.php
@@ -1695,8 +1695,12 @@ class File_Upload_Upgrader {
 			if ( ! ( ( $uploads = wp_upload_dir() ) && false === $uploads['error'] ) )
 				wp_die( $uploads['error'] );

-			$this->filename = $_GET[$urlholder];
+			$this->filename = sanitize_file_name( $_GET[ $urlholder ] );
 			$this->package = $uploads['basedir'] . '/' . $this->filename;
+
+			if ( 0 !== strpos( realpath( $this->package ), realpath( $uploads['basedir'] ) ) ) {
+				wp_die( __( 'Please select a file' ) );
+			}
 		}
 	}

--- a/wp-admin/includes/class-wp-users-list-table.php
+++ b/wp-admin/includes/class-wp-users-list-table.php
@@ -417,7 +417,7 @@ class WP_Users_List_Table extends WP_List_Table {
 					$r .= "<td $attributes>$user_object->first_name $user_object->last_name</td>";
 					break;
 				case 'email':
-					$r .= "<td $attributes><a href='mailto:$email' title='" . esc_attr( sprintf( __( 'E-mail: %s' ), $email ) ) . "'>$email</a></td>";
+					$r .= "<td $attributes><a href='" . esc_url( "mailto:$email" ) . "' title='" . esc_attr( sprintf( __( 'E-mail: %s' ), $email ) ) . "'>$email</a></td>";
 					break;
 				case 'role':
 					$r .= "<td $attributes>$role_name</td>";
--- a/wp-admin/includes/dashboard.php
+++ b/wp-admin/includes/dashboard.php
@@ -429,6 +429,10 @@ function wp_network_dashboard_right_now() {
 function wp_dashboard_quick_press( $error_msg = false ) {
 	global $post_ID;

+	if ( ! current_user_can( 'edit_posts' ) ) {
+		return;
+	}
+
 	/* Check if a new auto-draft (= no new post_ID) is needed or if the old can be used */
 	$last_post_id = (int) get_user_option( 'dashboard_quick_press_last_post_id' ); // Get the last post_ID
 	if ( $last_post_id ) {
@@ -531,7 +535,7 @@ function wp_dashboard_recent_drafts( $drafts = false ) {
 function _wp_dashboard_recent_comments_row( &$comment, $show_date = true ) {
 	$GLOBALS['comment'] =& $comment;

-	$comment_post_title = strip_tags(get_the_title( $comment->comment_post_ID ));
+	$comment_post_title = _draft_or_post_title( $comment->comment_post_ID );

 	if ( current_user_can( 'edit_post', $comment->comment_post_ID ) ) {
 		$comment_post_url = get_edit_post_link( $comment->comment_post_ID );
--- a/wp-admin/includes/image.php
+++ b/wp-admin/includes/image.php
@@ -366,6 +366,12 @@ function wp_read_image_metadata( $file ) {
 			$meta[ $key ] = utf8_encode( $meta[ $key ] );
 	}

+	foreach ( $meta as &$value ) {
+		if ( is_string( $value ) ) {
+			$value = wp_kses_post( $value );
+		}
+	}
+
 	/**
 	 * Filter the array of meta data read from an image's exif data.
 	 *
--- a/wp-admin/includes/media.php
+++ b/wp-admin/includes/media.php
@@ -262,7 +262,7 @@ function media_handle_upload($file_id, $post_id, $post_data = array(), $override
 	$url = $file['url'];
 	$type = $file['type'];
 	$file = $file['file'];
-	$title = $name;
+	$title = sanitize_text_field( $name );
 	$content = '';

 	if ( preg_match( '#^audio#', $type ) ) {
@@ -2943,6 +2943,8 @@ function wp_read_video_metadata( $file ) {

 	wp_add_id3_tag_data( $metadata, $data );

+	$metadata = wp_kses_post_deep( $metadata );
+
 	return $metadata;
 }

@@ -2982,5 +2984,7 @@ function wp_read_audio_metadata( $file ) {

 	wp_add_id3_tag_data( $metadata, $data );

+	$metadata = wp_kses_post_deep( $metadata );
+
 	return $metadata;
 }
--- a/wp-admin/includes/post.php
+++ b/wp-admin/includes/post.php
@@ -165,6 +165,13 @@ function _wp_translate_postdata( $update = false, $post_data = null ) {
 		$post_data['post_date_gmt'] = get_gmt_from_date( $post_data['post_date'] );
 	}

+	if ( isset( $post_data['post_category'] ) ) {
+		$category_object = get_taxonomy( 'category' );
+		if ( ! current_user_can( $category_object->cap->assign_terms ) ) {
+			unset( $post_data['post_category'] );
+		}
+	}
+
 	return $post_data;
 }

@@ -177,6 +184,7 @@ function _wp_translate_postdata( $update = false, $post_data = null ) {
 * @return int Post ID.
 */
 function edit_post( $post_data = null ) {
+	global $wpdb;

 	if ( empty($post_data) )
 		$post_data = &$_POST;
@@ -317,7 +325,19 @@ function edit_post( $post_data = null ) {

 	update_post_meta( $post_ID, '_edit_last', get_current_user_id() );

-	wp_update_post( $post_data );
+	$success = wp_update_post( $post_data );
+	// If the save failed, see if we can sanity check the main fields and try again
+	if ( ! $success && is_callable( array( $wpdb, 'strip_invalid_text_for_column' ) ) ) {
+		$fields = array( 'post_title', 'post_content', 'post_excerpt' );
+
+		foreach( $fields as $field ) {
+			if ( isset( $post_data[ $field ] ) ) {
+				$post_data[ $field ] = $wpdb->strip_invalid_text_for_column( $wpdb->posts, $field, $post_data[ $field ] );
+			}
+		}
+
+		wp_update_post( $post_data );
+	}

 	// Now that we have an ID we can fix any attachment anchor hrefs
 	_fix_attachment_links( $post_ID );
@@ -1193,11 +1213,11 @@ function get_sample_permalink_html( $id, $new_title = null, $new_slug = null ) {
 	}

 	if ( false === strpos($permalink, '%postname%') && false === strpos($permalink, '%pagename%') ) {
-		$return = '<strong>' . __('Permalink:') . "</strong>\n" . '<span id="sample-permalink" tabindex="-1">' . $permalink . "</span>\n";
+		$return = '<strong>' . __('Permalink:') . "</strong>\n" . '<span id="sample-permalink" tabindex="-1">' . esc_html( $permalink ) . "</span>\n";
 		if ( '' == get_option( 'permalink_structure' ) && current_user_can( 'manage_options' ) && !( 'page' == get_option('show_on_front') && $id == get_option('page_on_front') ) )
 			$return .= '<span id="change-permalinks"><a href="options-permalink.php" class="button button-small" target="_blank">' . __('Change Permalinks') . "</a></span>\n";
 		if ( isset( $view_post ) )
-			$return .= "<span id='view-post-btn'><a href='$permalink' class='button button-small'>$view_post</a></span>\n";
+			$return .= "<span id='view-post-btn'><a href='" . esc_url( $permalink ) . "' class='button button-small'>$view_post</a></span>\n";

 		/**
 		 * Filter the sample permalink HTML markup.
@@ -1228,17 +1248,17 @@ function get_sample_permalink_html( $id, $new_title = null, $new_slug = null ) {
 		}
 	}

-	$post_name_html = '<span id="editable-post-name" title="' . $title . '">' . $post_name_abridged . '</span>';
-	$display_link = str_replace(array('%pagename%','%postname%'), $post_name_html, $permalink);
-	$view_link = str_replace(array('%pagename%','%postname%'), $post_name, $permalink);
+	$post_name_html = '<span id="editable-post-name" title="' . $title . '">' . esc_html( $post_name_abridged ) . '</span>';
+	$display_link = str_replace(array('%pagename%','%postname%'), $post_name_html, esc_html( $permalink ) );
+	$view_link = str_replace(array('%pagename%','%postname%'), $post_name, esc_html( $permalink ) );
 	$return =  '<strong>' . __('Permalink:') . "</strong>\n";
 	$return .= '<span id="sample-permalink" tabindex="-1">' . $display_link . "</span>\n";
 	$return .= '&lrm;'; // Fix bi-directional text display defect in RTL languages.
 	$return .= '<span id="edit-slug-buttons"><a href="#post_name" class="edit-slug button button-small hide-if-no-js" onclick="editPermalink(' . $id . '); return false;">' . __('Edit') . "</a></span>\n";
-	$return .= '<span id="editable-post-name-full">' . $post_name . "</span>\n";
+	$return .= '<span id="editable-post-name-full">' . esc_html( $post_name ) . "</span>\n";

 	if ( isset( $view_post ) ) {
-		$return .= "<span id='view-post-btn'><a href='" . get_permalink( $post ) . "' class='button button-small'>$view_post</a></span>\n";
+		$return .= "<span id='view-post-btn'><a href='" . esc_url( get_permalink( $post ) ) . "' class='button button-small'>$view_post</a></span>\n";
 	}

 	/** This filter is documented in wp-admin/includes/post.php */
@@ -1456,7 +1476,7 @@ function _admin_notice_post_locked() {
 		// Allow plugins to prevent some users overriding the post lock
 		if ( $override ) {
 			?>
-			<a class="button button-primary wp-tab-last" href="<?php echo esc_url( add_query_arg( 'get-post-lock', '1', get_edit_post_link( $post->ID, 'url' ) ) ); ?>"><?php _e('Take over'); ?></a>
+			<a class="button button-primary wp-tab-last" href="<?php echo esc_url( add_query_arg( 'get-post-lock', '1', wp_nonce_url( get_edit_post_link( $post->ID, 'url' ), 'lock-post_' . $post->ID ) ) ); ?>"><?php _e('Take over'); ?></a>
 			<?php
 		}

--- a/wp-admin/includes/screen.php
+++ b/wp-admin/includes/screen.php
@@ -969,7 +969,8 @@ final class WP_Screen {

 		switch ( $this->id ) {
 			case 'widgets':
-				$this->_screen_settings = '<p><a id="access-on" href="widgets.php?widgets-access=on">' . __('Enable accessibility mode') . '</a><a id="access-off" href="widgets.php?widgets-access=off">' . __('Disable accessibility mode') . "</a></p>\n";
+				$nonce = wp_create_nonce( 'widgets-access' );
+				$this->_screen_settings = '<p><a id="access-on" href="widgets.php?widgets-access=on&_wpnonce=' . urlencode( $nonce ) . '">' . __('Enable accessibility mode') . '</a><a id="access-off" href="widgets.php?widgets-access=off&_wpnonce=' . urlencode( $nonce ) . '">' . __('Disable accessibility mode') . "</a></p>\n";
 				break;
 			default:
 				$this->_screen_settings = '';
--- a/wp-admin/includes/template.php
+++ b/wp-admin/includes/template.php
@@ -1437,7 +1437,7 @@ function _draft_or_post_title( $post = 0 ) {
 	$title = get_the_title( $post );
 	if ( empty( $title ) )
 		$title = __( '(no title)' );
-	return $title;
+	return esc_html( $title );
 }

 /**
--- a/wp-admin/includes/update-core.php
+++ b/wp-admin/includes/update-core.php
@@ -1011,6 +1011,9 @@ function update_core($from, $to) {
 		$wp_filesystem->delete($old_file, true);
 	}

+	// Remove any Genericons example.html's from the filesystem
+	_upgrade_422_remove_genericons();
+
 	// Upgrade DB with separate request
 	/** This filter is documented in wp-admin/includes/update-core.php */
 	apply_filters( 'update_feedback', __( 'Upgrading database&#8230;' ) );
@@ -1146,3 +1149,68 @@ window.location = 'about.php?updated';
 	exit();
 }
 add_action( '_core_updated_successfully', '_redirect_to_about_wordpress' );
+
+/**
+ * Cleans up Genericons example files.
+ *
+ * @since 4.2.2
+ */
+function _upgrade_422_remove_genericons() {
+	global $wp_theme_directories, $wp_filesystem;
+
+	// A list of the affected files using the filesystem absolute paths.
+	$affected_files = array();
+
+	// Themes
+	foreach ( $wp_theme_directories as $directory ) {
+		$directory = trailingslashit( $directory );
+		$affected_theme_files = _upgrade_422_find_genericons_files_in_folder( $directory );
+		$affected_files = array_merge( $affected_files, $affected_theme_files );
+	}
+
+	// Plugins
+	$plugin_dir = trailingslashit( WP_PLUGIN_DIR );
+	$affected_plugin_files = _upgrade_422_find_genericons_files_in_folder( $plugin_dir );
+	$affected_files = array_merge( $affected_files, $affected_plugin_files );
+
+	foreach ( $affected_files as $file ) {
+		$gen_dir = $wp_filesystem->find_folder( dirname( $file ) . '/' );
+		if ( ! $gen_dir ) {
+			continue;
+		}
+		// The path when the file is accessed via WP_Filesystem may differ in the case of FTP
+		$remote_file = $gen_dir . basename( $file );
+
+		if ( ! $wp_filesystem->exists( $remote_file ) ) {
+			continue;
+		}
+
+		if ( ! $wp_filesystem->delete( $remote_file, false, 'f' ) ) {
+			$wp_filesystem->put_contents( $remote_file, '' );
+		}
+	}
+}
+
+/**
+ * Recursively find Genericons example files in a given folder.
+ *
+ * @ignore
+ * @since 4.2.2
+ *
+ * @param string $directory Directory path. Expects trailingslashed.
+ * @return array
+ */
+function _upgrade_422_find_genericons_files_in_folder( $directory ) {
+
+	$files = array();
+	if ( file_exists( "{$directory}example.html" ) && false !== strpos( file_get_contents( "{$directory}example.html" ), '<title>Genericons</title>' ) ) {
+		$files[] = substr( "{$directory}example.html", strlen( $base ) );
+	}
+
+	foreach ( glob( $directory . '*', GLOB_ONLYDIR ) as $dir ) {
+		$dir = trailingslashit( $dir );
+		$files = array_merge( $files, _upgrade_422_find_genericons_files_in_folder( $dir ) );
+	}
+
+	return $files;
+}
--- a/wp-admin/includes/upgrade.php
+++ b/wp-admin/includes/upgrade.php
@@ -430,6 +430,9 @@ function upgrade_all() {
 	if ( $wp_current_db_version < 26691 )
 		upgrade_380();

+	if ( $wp_current_db_version < 27918 )
+		upgrade_397();
+
 	maybe_disable_link_manager();

 	maybe_disable_automattic_widgets();
@@ -1270,6 +1273,63 @@ function upgrade_380() {
 		deactivate_plugins( array( 'mp6/mp6.php' ), true );
 	}
 }
+
+/**
+ * Execute changes made in WordPress 3.9.6.
+ *
+ * @since 3.9.6
+ */
+function upgrade_396() {
+}
+
+/**
+ * Execute changes made in WordPress 3.9.7.
+ *
+ * @since 3.9.7
+ */
+function upgrade_397() {
+	global $wp_current_db_version, $wpdb;
+
+	if ( $wp_current_db_version < 27918 ) {
+		$content_length = $wpdb->get_col_length( $wpdb->comments, 'comment_content' );
+
+		if ( is_wp_error( $content_length ) ) {
+			return;
+		}
+
+		if ( false === $content_length ) {
+			$content_length = array(
+				'type'   => 'byte',
+				'length' => 65535,
+			);
+		} elseif ( ! is_array( $content_length ) ) {
+			$length = (int) $content_length > 0 ? (int) $content_length : 65535;
+			$content_length = array(
+				'type'	 => 'byte',
+				'length' => $length
+			);
+		}
+
+		if ( 'byte' !== $content_length['type'] || 0 === $content_length['length'] ) {
+			// Sites with malformed DB schemas are on their own.
+			return;
+		}
+
+		$allowed_length = intval( $content_length['length'] ) - 10;
+
+		$comments = $wpdb->get_results(
+			"SELECT `comment_ID` FROM `{$wpdb->comments}`
+				WHERE `comment_date_gmt` > '2015-04-26'
+				AND LENGTH( `comment_content` ) >= {$allowed_length}
+				AND ( `comment_content` LIKE '%<%' OR `comment_content` LIKE '%>%' )"
+		);
+
+		foreach ( $comments as $comment ) {
+			wp_delete_comment( $comment->comment_ID, true );
+		}
+	}
+}
+
 /**
 * Execute network level changes
 *
--- a/wp-admin/js/nav-menu.js
+++ b/wp-admin/js/nav-menu.js
@@ -451,14 +451,14 @@ var wpNavMenu;
 				if ( ! isPrimaryMenuItem ) {
 					thisLink = menuItem.find( '.menus-move-left' ),
 					thisLinkText = menus.outFrom.replace( '%s', prevItemNameLeft );
-					thisLink.prop( 'title', menus.moveOutFrom.replace( '%s', prevItemNameLeft ) ).html( thisLinkText ).css( 'display', 'inline' );
+					thisLink.prop( 'title', menus.moveOutFrom.replace( '%s', prevItemNameLeft ) ).text( thisLinkText ).css( 'display', 'inline' );
 				}

 				if ( 0 !== position ) {
 					if ( menuItem.find( '.menu-item-data-parent-id' ).val() !== menuItem.prev().find( '.menu-item-data-db-id' ).val() ) {
 						thisLink = menuItem.find( '.menus-move-right' ),
 						thisLinkText = menus.under.replace( '%s', prevItemNameRight );
-						thisLink.prop( 'title', menus.moveUnder.replace( '%s', prevItemNameRight ) ).html( thisLinkText ).css( 'display', 'inline' );
+						thisLink.prop( 'title', menus.moveUnder.replace( '%s', prevItemNameRight ) ).text( thisLinkText ).css( 'display', 'inline' );
 					}
 				}

@@ -480,7 +480,7 @@ var wpNavMenu;
 					title = menus.subMenuFocus.replace( '%1$s', itemName ).replace( '%2$d', itemPosition ).replace( '%3$s', parentItemName );
 				}

-				$this.prop('title', title).html( title );
+				$this.prop('title', title).text( title );
 			});
 		},

--- a/wp-admin/js/nav-menu.min.js
+++ b/wp-admin/js/nav-menu.min.js
--- a/wp-admin/network/settings.php
+++ b/wp-admin/network/settings.php
@@ -237,7 +237,7 @@ if ( isset( $_GET['updated'] ) ) {
 			<tr>
 				<th scope="row"><label for="first_comment_author"><?php _e( 'First Comment Author' ) ?></label></th>
 				<td>
-					<input type="text" size="40" name="first_comment_author" id="first_comment_author" value="<?php echo get_site_option('first_comment_author') ?>" />
+					<input type="text" size="40" name="first_comment_author" id="first_comment_author" value="<?php echo esc_attr( get_site_option('first_comment_author') ); ?>" />
 					<p class="description">
 						<?php _e( 'The author of the first comment on a new site.' ) ?>
 					</p>
--- a/wp-admin/plugins.php
+++ b/wp-admin/plugins.php
@@ -225,6 +225,14 @@ if ( $action ) {
 				exit;
 			}

+			// Bail on all if any paths are invalid.
+			// validate_file() returns truthy for invalid files
+			$invalid_plugin_files = array_filter( $plugins, 'validate_file' );
+			if ( $invalid_plugin_files ) {
+				wp_redirect( self_admin_url("plugins.php?plugin_status=$status&paged=$page&s=$s") );
+				exit;
+			}
+
 			include(ABSPATH . 'wp-admin/update.php');

 			$parent_file = 'plugins.php';
--- a/wp-admin/post.php
+++ b/wp-admin/post.php
@@ -113,8 +113,9 @@ case 'post-quickdraft-save':
 	if ( ! wp_verify_nonce( $nonce, 'add-post' ) )
 		$error_msg = __( 'Unable to submit this form, please refresh and try again.' );

-	if ( ! current_user_can( 'edit_posts' ) )
-		$error_msg = __( 'Oops, you don&#8217;t have access to add new drafts.' );
+	if ( ! current_user_can( 'edit_posts' ) ) {
+		exit;
+	}

 	if ( $error_msg )
 		return wp_dashboard_quick_press( $error_msg );
@@ -159,6 +160,7 @@ case 'edit':
 		wp_die( __( 'You can&#8217;t edit this item because it is in the Trash. Please restore it and try again.' ) );

 	if ( ! empty( $_GET['get-post-lock'] ) ) {
+		check_admin_referer( 'lock-post_' . $post_id );
 		wp_set_post_lock( $post_id );
 		wp_redirect( get_edit_post_link( $post_id, 'url' ) );
 		exit();
--- a/wp-admin/press-this.php
+++ b/wp-admin/press-this.php
@@ -32,8 +32,25 @@ function press_it() {
 	if ( !current_user_can('edit_post', $post_ID) )
 		wp_die(__('You are not allowed to edit this post.'));

-	$post['post_category'] = isset($_POST['post_category']) ? $_POST['post_category'] : '';
-	$post['tax_input'] = isset($_POST['tax_input']) ? $_POST['tax_input'] : '';
+	// Only accept categories if the user actually can assign
+	$category_tax = get_taxonomy( 'category' );
+	if ( current_user_can( $category_tax->cap->assign_terms ) ) {
+		$post['post_category'] = ( ! empty( $_POST['post_category'] ) ) ? $_POST['post_category'] : array();
+	}
+
+	// Only accept taxonomies if the user can actually assign
+	if ( ! empty( $_POST['tax_input'] ) ) {
+		$tax_input = $_POST['tax_input'];
+		foreach ( $tax_input as $tax => $_ti ) {
+			$tax_object = get_taxonomy( $tax );
+			if ( ! $tax_object || ! current_user_can( $tax_object->cap->assign_terms ) ) {
+				unset( $tax_input[ $tax ] );
+			}
+		}
+
+		$post['tax_input'] = $tax_input;
+	}
+
 	$post['post_title'] = isset($_POST['title']) ? $_POST['title'] : '';
 	$content = isset($_POST['content']) ? $_POST['content'] : '';

@@ -63,7 +80,7 @@ function press_it() {
 	// error handling for media_sideload
 	if ( is_wp_error($upload) ) {
 		wp_delete_post($post_ID);
-		wp_die($upload);
+		wp_die( esc_html( $upload->get_error_message() ) );
 	} else {
 		// Post formats
 		if ( isset( $_POST['post_format'] ) ) {
@@ -512,75 +529,81 @@ $admin_body_class .= ' locale-' . sanitize_html_class( strtolower( str_replace(
 				</div>
 			</div>

-			<?php $tax = get_taxonomy( 'category' ); ?>
-			<div id="categorydiv" class="postbox">
-				<div class="handlediv" title="<?php esc_attr_e( 'Click to toggle' ); ?>"><br /></div>
-				<h3 class="hndle"><?php _e('Categories') ?></h3>
-				<div class="inside">
-				<div id="taxonomy-category" class="categorydiv">
+			<?php

-					<ul id="category-tabs" class="category-tabs">
-						<li class="tabs"><a href="#category-all"><?php echo $tax->labels->all_items; ?></a></li>
-						<li class="hide-if-no-js"><a href="#category-pop"><?php _e( 'Most Used' ); ?></a></li>
-					</ul>
+			$tax = get_taxonomy( 'category' );
+			if ( current_user_can( $tax->cap->assign_terms ) ) :
+				?>
+				<div id="categorydiv" class="postbox">
+					<div class="handlediv" title="<?php esc_attr_e( 'Click to toggle' ); ?>"><br /></div>
+					<h3 class="hndle"><?php _e('Categories') ?></h3>
+					<div class="inside">
+					<div id="taxonomy-category" class="categorydiv">

-					<div id="category-pop" class="tabs-panel" style="display: none;">
-						<ul id="categorychecklist-pop" class="categorychecklist form-no-clear" >
-							<?php $popular_ids = wp_popular_terms_checklist( 'category' ); ?>
+						<ul id="category-tabs" class="category-tabs">
+							<li class="tabs"><a href="#category-all"><?php echo $tax->labels->all_items; ?></a></li>
+							<li class="hide-if-no-js"><a href="#category-pop"><?php _e( 'Most Used' ); ?></a></li>
 						</ul>
-					</div>

-					<div id="category-all" class="tabs-panel">
-						<ul id="categorychecklist" data-wp-lists="list:category" class="categorychecklist form-no-clear">
-							<?php wp_terms_checklist($post_ID, array( 'taxonomy' => 'category', 'popular_cats' => $popular_ids ) ) ?>
-						</ul>
-					</div>
-
-					<?php if ( !current_user_can($tax->cap->assign_terms) ) : ?>
-					<p><em><?php _e('You cannot modify this Taxonomy.'); ?></em></p>
-					<?php endif; ?>
-					<?php if ( current_user_can($tax->cap->edit_terms) ) : ?>
-						<div id="category-adder" class="wp-hidden-children">
-							<h4>
-								<a id="category-add-toggle" href="#category-add" class="hide-if-no-js">
-									<?php printf( __( '+ %s' ), $tax->labels->add_new_item ); ?>
-								</a>
-							</h4>
-							<p id="category-add" class="category-add wp-hidden-child">
-								<label class="screen-reader-text" for="newcategory"><?php echo $tax->labels->add_new_item; ?></label>
-								<input type="text" name="newcategory" id="newcategory" class="form-required form-input-tip" value="<?php echo esc_attr( $tax->labels->new_item_name ); ?>" aria-required="true"/>
-								<label class="screen-reader-text" for="newcategory_parent">
-									<?php echo $tax->labels->parent_item_colon; ?>
-								</label>
-								<?php wp_dropdown_categories( array( 'taxonomy' => 'category', 'hide_empty' => 0, 'name' => 'newcategory_parent', 'orderby' => 'name', 'hierarchical' => 1, 'show_option_none' => '&mdash; ' . $tax->labels->parent_item . ' &mdash;' ) ); ?>
-								<input type="button" id="category-add-submit" data-wp-lists="add:categorychecklist:category-add" class="button category-add-submit" value="<?php echo esc_attr( $tax->labels->add_new_item ); ?>" />
-								<?php wp_nonce_field( 'add-category', '_ajax_nonce-add-category', false ); ?>
-								<span id="category-ajax-response"></span>
-							</p>
+						<div id="category-pop" class="tabs-panel" style="display: none;">
+							<ul id="categorychecklist-pop" class="categorychecklist form-no-clear" >
+								<?php $popular_ids = wp_popular_terms_checklist( 'category' ); ?>
+							</ul>
 						</div>
-					<?php endif; ?>
-				</div>
-				</div>
-			</div>

-			<div id="tagsdiv-post_tag" class="postbox">
-				<div class="handlediv" title="<?php esc_attr_e( 'Click to toggle' ); ?>"><br /></div>
-				<h3><span><?php _e('Tags'); ?></span></h3>
-				<div class="inside">
-					<div class="tagsdiv" id="post_tag">
-						<div class="jaxtag">
-							<label class="screen-reader-text" for="newtag"><?php _e('Tags'); ?></label>
-							<input type="hidden" name="tax_input[post_tag]" class="the-tags" id="tax-input[post_tag]" value="" />
-							<div class="ajaxtag">
-								<input type="text" name="newtag[post_tag]" class="newtag form-input-tip" size="16" autocomplete="off" value="" />
-								<input type="button" class="button tagadd" value="<?php esc_attr_e('Add'); ?>" />
+						<div id="category-all" class="tabs-panel">
+							<ul id="categorychecklist" data-wp-lists="list:category" class="categorychecklist form-no-clear">
+								<?php wp_terms_checklist($post_ID, array( 'taxonomy' => 'category', 'popular_cats' => $popular_ids ) ) ?>
+							</ul>
+						</div>
+
+						<?php if ( current_user_can($tax->cap->edit_terms) ) : ?>
+							<div id="category-adder" class="wp-hidden-children">
+								<h4>
+									<a id="category-add-toggle" href="#category-add" class="hide-if-no-js">
+										<?php printf( __( '+ %s' ), $tax->labels->add_new_item ); ?>
+									</a>
+								</h4>
+								<p id="category-add" class="category-add wp-hidden-child">
+									<label class="screen-reader-text" for="newcategory"><?php echo $tax->labels->add_new_item; ?></label>
+									<input type="text" name="newcategory" id="newcategory" class="form-required form-input-tip" value="<?php echo esc_attr( $tax->labels->new_item_name ); ?>" aria-required="true"/>
+									<label class="screen-reader-text" for="newcategory_parent">
+										<?php echo $tax->labels->parent_item_colon; ?>
+									</label>
+									<?php wp_dropdown_categories( array( 'taxonomy' => 'category', 'hide_empty' => 0, 'name' => 'newcategory_parent', 'orderby' => 'name', 'hierarchical' => 1, 'show_option_none' => '&mdash; ' . $tax->labels->parent_item . ' &mdash;' ) ); ?>
+									<input type="button" id="category-add-submit" data-wp-lists="add:categorychecklist:category-add" class="button category-add-submit" value="<?php echo esc_attr( $tax->labels->add_new_item ); ?>" />
+									<?php wp_nonce_field( 'add-category', '_ajax_nonce-add-category', false ); ?>
+									<span id="category-ajax-response"></span>
+								</p>
 							</div>
-						</div>
-						<div class="tagchecklist"></div>
+						<?php endif; ?>
+					</div>
 					</div>
-					<p class="tagcloud-link"><a href="#titlediv" class="tagcloud-link" id="link-post_tag"><?php _e('Choose from the most used tags'); ?></a></p>
 				</div>
-			</div>
+			<?php endif;
+
+			$tax = get_taxonomy( 'post_tag' );
+			if ( current_user_can( $tax->cap->assign_terms ) ) :
+				?>
+				<div id="tagsdiv-post_tag" class="postbox">
+					<div class="handlediv" title="<?php esc_attr_e( 'Click to toggle' ); ?>"><br /></div>
+					<h3><span><?php _e('Tags'); ?></span></h3>
+					<div class="inside">
+						<div class="tagsdiv" id="post_tag">
+							<div class="jaxtag">
+								<label class="screen-reader-text" for="newtag"><?php _e('Tags'); ?></label>
+								<input type="hidden" name="tax_input[post_tag]" class="the-tags" id="tax-input[post_tag]" value="" />
+								<div class="ajaxtag">
+									<input type="text" name="newtag[post_tag]" class="newtag form-input-tip" size="16" autocomplete="off" value="" />
+									<input type="button" class="button tagadd" value="<?php esc_attr_e('Add'); ?>" />
+								</div>
+							</div>
+							<div class="tagchecklist"></div>
+						</div>
+						<p class="tagcloud-link"><a href="#titlediv" class="tagcloud-link" id="link-post_tag"><?php _e('Choose from the most used tags'); ?></a></p>
+					</div>
+				</div>
+			<?php endif; ?>
 		</div>
 	</div>
 	<div class="posting">
--- a/wp-admin/revision.php
+++ b/wp-admin/revision.php
@@ -63,7 +63,7 @@ default :
 	if ( ! $post = get_post( $revision->post_parent ) )
 		break;

-	if ( ! current_user_can( 'read_post', $revision->ID ) || ! current_user_can( 'read_post', $post->ID ) )
+	if ( ! current_user_can( 'read_post', $revision->ID ) || ! current_user_can( 'edit_post', $revision->post_parent ) )
 		break;

 	// Revisions disabled and we're not looking at an autosave
--- a/wp-admin/update-core.php
+++ b/wp-admin/update-core.php
@@ -238,6 +238,8 @@ function list_plugin_updates() {
 	<tbody class="plugins">
 <?php
 	foreach ( (array) $plugins as $plugin_file => $plugin_data) {
+		$plugin_data = (object) _get_plugin_data_markup_translate( $plugin_file, (array) $plugin_data, false, true );
+
 		$info = plugins_api('plugin_information', array('slug' => $plugin_data->update->slug ));
 		// Get plugin compat for running version of WordPress.
 		if ( isset($info->tested) && version_compare($info->tested, $cur_wp_version, '>=') ) {
--- a/wp-admin/user-edit.php
+++ b/wp-admin/user-edit.php
@@ -98,7 +98,7 @@ if ( is_multisite()
 // Execute confirmed email change. See send_confirmation_on_profile_email().
 if ( is_multisite() && IS_PROFILE_PAGE && isset( $_GET[ 'newuseremail' ] ) && $current_user->ID ) {
 	$new_email = get_option( $current_user->ID . '_new_email' );
-	if ( $new_email[ 'hash' ] == $_GET[ 'newuseremail' ] ) {
+	if ( $new_email && hash_equals( $new_email[ 'hash' ], $_GET[ 'newuseremail' ] ) ) {
 		$user = new stdClass;
 		$user->ID = $current_user->ID;
 		$user->user_email = esc_html( trim( $new_email[ 'newemail' ] ) );
@@ -109,7 +109,8 @@ if ( is_multisite() && IS_PROFILE_PAGE && isset( $_GET[ 'newuseremail' ] ) && $c
 		wp_redirect( add_query_arg( array('updated' => 'true'), self_admin_url( 'profile.php' ) ) );
 		die();
 	}
-} elseif ( is_multisite() && IS_PROFILE_PAGE && !empty( $_GET['dismiss'] ) && $current_user->ID . '_new_email' == $_GET['dismiss'] ) {
+} elseif ( is_multisite() && IS_PROFILE_PAGE && !empty( $_GET['dismiss'] ) && $current_user->ID . '_new_email' === $_GET['dismiss'] ) {
+	check_admin_referer( 'dismiss-' . $current_user->ID . '_new_email' );
 	delete_option( $current_user->ID . '_new_email' );
 	wp_redirect( add_query_arg( array('updated' => 'true'), self_admin_url( 'profile.php' ) ) );
 	die();
@@ -406,7 +407,7 @@ if ( is_multisite() && is_network_admin() && ! IS_PROFILE_PAGE && current_user_c
 	$new_email = get_option( $current_user->ID . '_new_email' );
 	if ( $new_email && $new_email['newemail'] != $current_user->user_email && $profileuser->ID == $current_user->ID ) : ?>
 	<div class="updated inline">
-	<p><?php printf( __('There is a pending change of your e-mail to <code>%1$s</code>. <a href="%2$s">Cancel</a>'), $new_email['newemail'], esc_url( self_admin_url( 'profile.php?dismiss=' . $current_user->ID . '_new_email' ) ) ); ?></p>
+	<p><?php printf( __('There is a pending change of your e-mail to <code>%1$s</code>. <a href="%2$s">Cancel</a>'), esc_html( $new_email['newemail'] ), esc_url( wp_nonce_url( self_admin_url( 'profile.php?dismiss=' . $current_user->ID . '_new_email' ), 'dismiss-' . $current_user->ID . '_new_email' ) ) ); ?></p>
 	</div>
 	<?php endif; ?>
 	</td>
--- a/wp-admin/widgets.php
+++ b/wp-admin/widgets.php
@@ -17,6 +17,8 @@ if ( ! current_user_can('edit_theme_options') )

 $widgets_access = get_user_setting( 'widgets_access' );
 if ( isset($_GET['widgets-access']) ) {
+	check_admin_referer( 'widgets-access' );
+
 	$widgets_access = 'on' == $_GET['widgets-access'] ? 'on' : 'off';
 	set_user_setting( 'widgets_access', $widgets_access );
 }
--- a/wp-includes/ID3/getid3.lib.php
+++ b/wp-includes/ID3/getid3.lib.php
@@ -519,11 +519,12 @@ class getid3_lib
 	}

 	public static function XML2array($XMLstring) {
-		if (function_exists('simplexml_load_string')) {
-			if (function_exists('get_object_vars')) {
-				$XMLobject = simplexml_load_string($XMLstring);
-				return self::SimpleXMLelement2array($XMLobject);
-			}
+		if ( function_exists( 'simplexml_load_string' ) && function_exists( 'libxml_disable_entity_loader' ) ) {
+			$loader = libxml_disable_entity_loader( true );
+			$XMLobject = simplexml_load_string( $XMLstring, 'SimpleXMLElement', LIBXML_NOENT );
+			$return = self::SimpleXMLelement2array( $XMLobject );
+			libxml_disable_entity_loader( $loader );
+			return $return;
 		}
 		return false;
 	}
--- a/wp-includes/capabilities.php
+++ b/wp-includes/capabilities.php
@@ -1100,8 +1100,10 @@ function map_meta_cap( $cap, $user_id ) {
 	case 'edit_post':
 	case 'edit_page':
 		$post = get_post( $args[0] );
-		if ( empty( $post ) )
+		if ( empty( $post ) ) {
+			$caps[] = 'do_not_allow';
 			break;
+		}

 		if ( 'revision' == $post->post_type ) {
 			$post = get_post( $post->post_parent );
@@ -1215,7 +1217,16 @@ function map_meta_cap( $cap, $user_id ) {
 		if ( empty( $comment ) )
 			break;
 		$post = get_post( $comment->comment_post_ID );
-		$caps = map_meta_cap( 'edit_post', $user_id, $post->ID );
+
+		/*
+		 * If the post doesn't exist, we have an orphaned comment.
+		 * Fall back to the edit_posts capability, instead.
+		 */
+		if ( $post ) {
+			$caps = map_meta_cap( 'edit_post', $user_id, $post->ID );
+		} else {
+			$caps = map_meta_cap( 'edit_posts', $user_id );
+		}
 		break;
 	case 'unfiltered_upload':
 		if ( defined('ALLOW_UNFILTERED_UPLOADS') && ALLOW_UNFILTERED_UPLOADS && ( !is_multisite() || is_super_admin( $user_id ) )  )
@@ -1347,21 +1358,25 @@ function current_user_can( $capability ) {
 * @return bool
 */
 function current_user_can_for_blog( $blog_id, $capability ) {
-	if ( is_multisite() )
-		switch_to_blog( $blog_id );
+	$switched = is_multisite() ? switch_to_blog( $blog_id ) : false;

 	$current_user = wp_get_current_user();

-	if ( empty( $current_user ) )
+	if ( empty( $current_user ) ) {
+		if ( $switched ) {
+			restore_current_blog();
+		}
 		return false;
+	}

 	$args = array_slice( func_get_args(), 2 );
 	$args = array_merge( array( $capability ), $args );

 	$can = call_user_func_array( array( $current_user, 'has_cap' ), $args );

-	if ( is_multisite() )
+	if ( $switched ) {
 		restore_current_blog();
+	}

 	return $can;
 }
--- a/wp-includes/class-IXR.php
+++ b/wp-includes/class-IXR.php
@@ -203,11 +203,37 @@ class IXR_Message
    {
        // first remove the XML declaration
        // merged from WP #10698 - this method avoids the RAM usage of preg_replace on very large messages
-        $header = preg_replace( '/<\?xml.*?\?'.'>/', '', substr($this->message, 0, 100), 1);
-        $this->message = substr_replace($this->message, $header, 0, 100);
-        if (trim($this->message) == '') {
+        $header = preg_replace( '/<\?xml.*?\?'.'>/s', '', substr( $this->message, 0, 100 ), 1 );
+        $this->message = trim( substr_replace( $this->message, $header, 0, 100 ) );
+        if ( '' == $this->message ) {
            return false;
        }
+
+        // Then remove the DOCTYPE
+        $header = preg_replace( '/^<!DOCTYPE[^>]*+>/i', '', substr( $this->message, 0, 200 ), 1 );
+        $this->message = trim( substr_replace( $this->message, $header, 0, 200 ) );
+        if ( '' == $this->message ) {
+            return false;
+        }
+
+        // Check that the root tag is valid
+        $root_tag = substr( $this->message, 0, strcspn( substr( $this->message, 0, 20 ), "> \t\r\n" ) );
+        if ( '<!DOCTYPE' === strtoupper( $root_tag ) ) {
+            return false;
+        }
+        if ( ! in_array( $root_tag, array( '<methodCall', '<methodResponse', '<fault' ) ) ) {
+            return false;
+        }
+
+        // Bail if there are too many elements to parse
+        $element_limit = 30000;
+        if ( function_exists( 'apply_filters' ) ) {
+            $element_limit = apply_filters( 'xmlrpc_element_limit', $element_limit );
+        }
+        if ( $element_limit && 2 * $element_limit < substr_count( $this->message, '<' ) ) {
+            return false;
+        }
+
        $this->_parser = xml_parser_create();
        // Set XML parser to take the case of tags in to account
        xml_parser_set_option($this->_parser, XML_OPTION_CASE_FOLDING, false);
--- a/wp-includes/class-phpass.php
+++ b/wp-includes/class-phpass.php
@@ -214,6 +214,10 @@ class PasswordHash {

 	function HashPassword($password)
 	{
+		if ( strlen( $password ) > 4096 ) {
+			return '*';
+		}
+
 		$random = '';

 		if (CRYPT_BLOWFISH == 1 && !$this->portable_hashes) {
@@ -249,6 +253,10 @@ class PasswordHash {

 	function CheckPassword($password, $stored_hash)
 	{
+		if ( strlen( $password ) > 4096 ) {
+			return false;
+		}
+
 		$hash = $this->crypt_private($password, $stored_hash);
 		if ($hash[0] == '*')
 			$hash = crypt($password, $stored_hash);
--- a/wp-includes/class-phpmailer.php
+++ b/wp-includes/class-phpmailer.php
--- a/wp-includes/class-smtp.php
+++ b/wp-includes/class-smtp.php
--- a/wp-includes/class-snoopy.php
+++ b/wp-includes/class-snoopy.php
@@ -999,20 +999,23 @@ class Snoopy
 		if(!empty($this->user) || !empty($this->pass))
 			$headers[] = "Authorization: BASIC ".base64_encode($this->user.":".$this->pass);

-		for($curr_header = 0; $curr_header < count($headers); $curr_header++) {
-			$safer_header = strtr( $headers[$curr_header], "\"", " " );
-			$cmdline_params .= " -H \"".$safer_header."\"";
+		$headerfile = tempnam( $this->temp_dir, "sno" );
+		$cmdline_params = '-k -D ' . escapeshellarg( $headerfile );
+
+		foreach ( $headers as $header ) {
+			$cmdline_params .= ' -H ' . escapeshellarg( $header );
 		}

-		if(!empty($body))
-			$cmdline_params .= " -d \"$body\"";
+		if ( ! empty( $body ) ) {
+			$cmdline_params .= ' -d ' . escapeshellarg( $body );
+		}

-		if($this->read_timeout > 0)
-			$cmdline_params .= " -m ".$this->read_timeout;
+		if ( $this->read_timeout > 0 ) {
+			$cmdline_params .= ' -m ' . escapeshellarg( $this->read_timeout );
+		}

-		$headerfile = tempnam($this->temp_dir, "sno");

-		exec($this->curl_path." -k -D \"$headerfile\"".$cmdline_params." \"".escapeshellcmd($URI)."\"",$results,$return);
+		exec( $this->curl_path . ' ' . $cmdline_params . ' ' . escapeshellarg( $URI ), $results, $return );

 		if($return)
 		{
--- a/wp-includes/class-wp-customize-widgets.php
+++ b/wp-includes/class-wp-customize-widgets.php
@@ -1119,22 +1119,19 @@ final class WP_Customize_Widgets {
 	}

 	/**
-	 * Get a widget instance's hash key.
+	 * Get MAC for a serialized widget instance string.
 	 *
-	 * Serialize an instance and hash it with the AUTH_KEY; when a JS value is
-	 * posted back to save, this instance hash key is used to ensure that the
-	 * serialized_instance was not tampered with, but that it had originated
-	 * from WordPress and so is sanitized.
+	 * Allows values posted back from JS to be rejected if any tampering of the
+	 * data has occurred.
 	 *
 	 * @since 3.9.0
 	 * @access protected
 	 *
-	 * @param array $instance Widget instance.
-	 * @return string Widget instance's hash key.
+	 * @param string $serialized_instance Widget instance.
+	 * @return string MAC for serialized widget instance.
 	 */
-	protected function get_instance_hash_key( $instance ) {
-		$hash = md5( AUTH_KEY . serialize( $instance ) );
-		return $hash;
+	protected function get_instance_hash_key( $serialized_instance ) {
+		return wp_hash( $serialized_instance );
 	}

 	/**
@@ -1162,18 +1159,19 @@ final class WP_Customize_Widgets {
 		}

 		$decoded = base64_decode( $value['encoded_serialized_instance'], true );
-
 		if ( false === $decoded ) {
 			return null;
 		}
-		$instance = unserialize( $decoded );

+		if ( ! hash_equals( $this->get_instance_hash_key( $decoded ), $value['instance_hash_key'] ) ) {
+			return null;
+		}
+
+		$instance = unserialize( $decoded );
 		if ( false === $instance ) {
 			return null;
 		}
-		if ( $this->get_instance_hash_key( $instance ) !== $value['instance_hash_key'] ) {
-			return null;
-		}
+
 		return $instance;
 	}

@@ -1194,7 +1192,7 @@ final class WP_Customize_Widgets {
 				'encoded_serialized_instance'   => base64_encode( $serialized ),
 				'title'                         => empty( $value['title'] ) ? '' : $value['title'],
 				'is_widget_customizer_js_value' => true,
-				'instance_hash_key'             => $this->get_instance_hash_key( $value ),
+				'instance_hash_key'             => $this->get_instance_hash_key( $serialized ),
 			);
 		}
 		return $value;
--- a/wp-includes/class-wp-editor.php
+++ b/wp-includes/class-wp-editor.php
@@ -103,12 +103,6 @@ final class _WP_Editors {
 			// A cookie (set when a user resizes the editor) overrides the height.
 			$cookie = (int) get_user_setting( 'ed_size' );

-			// Upgrade an old TinyMCE cookie if it is still around, and the new one isn't.
-			if ( ! $cookie && isset( $_COOKIE['TinyMCE_content_size'] ) ) {
-				parse_str( $_COOKIE['TinyMCE_content_size'], $cookie );
- 				$cookie = $cookie['ch'];
-			}
-
 			if ( $cookie )
 				$set['editor_height'] = $cookie;
 		}
--- a/wp-includes/class-wp-embed.php
+++ b/wp-includes/class-wp-embed.php
@@ -57,7 +57,7 @@ class WP_Embed {
 		add_shortcode( 'embed', array( $this, 'shortcode' ) );

 		// Do the shortcode (only the [embed] one is registered)
-		$content = do_shortcode( $content );
+		$content = do_shortcode( $content, true );

 		// Put the original shortcodes back
 		$shortcode_tags = $orig_shortcode_tags;
@@ -291,7 +291,14 @@ class WP_Embed {
 	 * @return string Potentially modified $content.
 	 */
 	function autoembed( $content ) {
-		return preg_replace_callback( '|^\s*(https?://[^\s"]+)\s*$|im', array( $this, 'autoembed_callback' ), $content );
+		// Replace line breaks from all HTML elements with placeholders.
+		$content = wp_replace_in_html_tags( $content, array( "\n" => '<!-- wp-line-break -->' ) );
+
+		// Find URLs that are on their own line.
+		$content = preg_replace_callback( '|^\s*(https?://[^\s"]+)\s*$|im', array( $this, 'autoembed_callback' ), $content );
+
+		// Put the line breaks back.
+		return str_replace( '<!-- wp-line-break -->', "\n", $content );
 	}

 	/**
--- a/wp-includes/class-wp-theme.php
+++ b/wp-includes/class-wp-theme.php
@@ -216,7 +216,7 @@ final class WP_Theme implements ArrayAccess {
 		} elseif ( ! file_exists( $this->theme_root . '/' . $theme_file ) ) {
 			$this->headers['Name'] = $this->stylesheet;
 			if ( ! file_exists( $this->theme_root . '/' . $this->stylesheet ) )
-				$this->errors = new WP_Error( 'theme_not_found', sprintf( __( 'The theme directory "%s" does not exist.' ), $this->stylesheet ) );
+				$this->errors = new WP_Error( 'theme_not_found', sprintf( __( 'The theme directory "%s" does not exist.' ), esc_html( $this->stylesheet ) ) );
 			else
 				$this->errors = new WP_Error( 'theme_no_stylesheet', __( 'Stylesheet is missing.' ) );
 			$this->template = $this->stylesheet;
@@ -263,7 +263,7 @@ final class WP_Theme implements ArrayAccess {
 				$theme_root_template = $directories[ $this->template ]['theme_root'];
 			} else {
 				// Parent theme is missing.
-				$this->errors = new WP_Error( 'theme_no_parent', sprintf( __( 'The parent theme is missing. Please install the "%s" parent theme.' ), $this->template ) );
+				$this->errors = new WP_Error( 'theme_no_parent', sprintf( __( 'The parent theme is missing. Please install the "%s" parent theme.' ), esc_html( $this->template ) ) );
 				$this->cache_add( 'theme', array( 'headers' => $this->headers, 'errors' => $this->errors, 'stylesheet' => $this->stylesheet, 'template' => $this->template ) );
 				$this->parent = new WP_Theme( $this->template, $this->theme_root, $this );
 				return;
@@ -275,11 +275,11 @@ final class WP_Theme implements ArrayAccess {
 			// If we are a parent, then there is a problem. Only two generations allowed! Cancel things out.
 			if ( is_a( $_child, 'WP_Theme' ) && $_child->template == $this->stylesheet ) {
 				$_child->parent = null;
-				$_child->errors = new WP_Error( 'theme_parent_invalid', sprintf( __( 'The "%s" theme is not a valid parent theme.' ), $_child->template ) );
+				$_child->errors = new WP_Error( 'theme_parent_invalid', sprintf( __( 'The "%s" theme is not a valid parent theme.' ), esc_html( $_child->template ) ) );
 				$_child->cache_add( 'theme', array( 'headers' => $_child->headers, 'errors' => $_child->errors, 'stylesheet' => $_child->stylesheet, 'template' => $_child->template ) );
 				// The two themes actually reference each other with the Template header.
 				if ( $_child->stylesheet == $this->template ) {
-					$this->errors = new WP_Error( 'theme_parent_invalid', sprintf( __( 'The "%s" theme is not a valid parent theme.' ), $this->template ) );
+					$this->errors = new WP_Error( 'theme_parent_invalid', sprintf( __( 'The "%s" theme is not a valid parent theme.' ), esc_html( $this->template ) ) );
 					$this->cache_add( 'theme', array( 'headers' => $this->headers, 'errors' => $this->errors, 'stylesheet' => $this->stylesheet, 'template' => $this->template ) );
 				}
 				return;
@@ -654,8 +654,9 @@ final class WP_Theme implements ArrayAccess {
 	private function markup_header( $header, $value, $translate ) {
 		switch ( $header ) {
 			case 'Name' :
-				if ( empty( $value ) )
-					$value = $this->get_stylesheet();
+				if ( empty( $value ) ) {
+					$value = esc_html( $this->get_stylesheet() );
+				}
 				break;
 			case 'Description' :
 				$value = wptexturize( $value );
--- a/wp-includes/class-wp-xmlrpc-server.php
+++ b/wp-includes/class-wp-xmlrpc-server.php
@@ -1108,6 +1108,56 @@ class wp_xmlrpc_server extends IXR_Server {
 		return $count > 1;
 	}

+	private function _validate_boolean( $var ) {
+		if ( is_bool( $var ) ) {
+			return $var;
+		}
+
+		if ( is_string( $var ) && 'false' === strtolower( $var ) ) {
+			return false;
+		}
+
+		return (bool) $var;
+	}
+
+	/**
+	 * Encapsulate the logic for sticking a post
+	 * and determining if the user has permission to do so
+	 *
+	 * @since 4.3.0
+	 * @access private
+	 *
+	 * @param array $post_data
+	 * @param bool  $update
+	 * @return void|IXR_Error
+	 */
+	private function _toggle_sticky( $post_data, $update = false ) {
+		$post_type = get_post_type_object( $post_data['post_type'] );
+
+		// Private and password-protected posts cannot be stickied.
+		if ( 'private' === $post_data['post_status'] || ! empty( $post_data['post_password'] ) ) {
+			// Error if the client tried to stick the post, otherwise, silently unstick.
+			if ( ! empty( $post_data['sticky'] ) ) {
+				return new IXR_Error( 401, __( 'Sorry, you cannot stick a private post.' ) );
+			}
+
+			if ( $update ) {
+				unstick_post( $post_data['ID'] );
+			}
+		} elseif ( isset( $post_data['sticky'] ) )  {
+			if ( ! current_user_can( $post_type->cap->edit_others_posts ) ) {
+				return new IXR_Error( 401, __( 'Sorry, you are not allowed to stick this post.' ) );
+			}
+
+			$sticky = $this->_validate_boolean( $post_data['sticky'] );
+			if ( $sticky ) {
+				stick_post( $post_data['ID'] );
+			} else {
+				unstick_post( $post_data['ID'] );
+			}
+		}
+	}
+
 	/**
 	 * Helper method for wp_newPost and wp_editPost, containing shared logic.
 	 *
@@ -1200,20 +1250,9 @@ class wp_xmlrpc_server extends IXR_Server {
 		$post_ID = $post_data['ID'];

 		if ( $post_data['post_type'] == 'post' ) {
-			// Private and password-protected posts cannot be stickied.
-			if ( $post_data['post_status'] == 'private' || ! empty( $post_data['post_password'] ) ) {
-				// Error if the client tried to stick the post, otherwise, silently unstick.
-				if ( ! empty( $post_data['sticky'] ) )
-					return new IXR_Error( 401, __( 'Sorry, you cannot stick a private post.' ) );
-				if ( $update )
-					unstick_post( $post_ID );
-			} elseif ( isset( $post_data['sticky'] ) )  {
-				if ( ! current_user_can( $post_type->cap->edit_others_posts ) )
-					return new IXR_Error( 401, __( 'Sorry, you are not allowed to stick this post.' ) );
-				if ( $post_data['sticky'] )
-					stick_post( $post_ID );
-				else
-					unstick_post( $post_ID );
+			$error = $this->_toggle_sticky( $post_data, $update );
+			if ( $error ) {
+				return $error;
 			}
 		}

@@ -4586,10 +4625,12 @@ class wp_xmlrpc_server extends IXR_Server {

 		// Only posts can be sticky
 		if ( $post_type == 'post' && isset( $content_struct['sticky'] ) ) {
-			if ( $content_struct['sticky'] == true )
-				stick_post( $post_ID );
-			elseif ( $content_struct['sticky'] == false )
-				unstick_post( $post_ID );
+			$data = $postdata;
+			$data['sticky'] = $content_struct['sticky'];
+			$error = $this->_toggle_sticky( $data );
+			if ( $error ) {
+				return $error;
+			}
 		}

 		if ( isset($content_struct['custom_fields']) )
@@ -4862,11 +4903,12 @@ class wp_xmlrpc_server extends IXR_Server {

 		$tags_input = isset( $content_struct['mt_keywords'] ) ? $content_struct['mt_keywords'] : null;

-		if ( ('publish' == $post_status) ) {
-			if ( ( 'page' == $post_type ) && !current_user_can('publish_pages') )
-				return new IXR_Error(401, __('Sorry, you do not have the right to publish this page.'));
-			else if ( !current_user_can('publish_posts') )
-				return new IXR_Error(401, __('Sorry, you do not have the right to publish this post.'));
+		if ( 'publish' == $post_status || 'private' == $post_status ) {
+			if ( 'page' == $post_type && ! current_user_can( 'publish_pages' ) ) {
+				return new IXR_Error( 401, __( 'Sorry, you do not have the right to publish this page.' ) );
+			} elseif ( ! current_user_can( 'publish_posts' ) ) {
+				return new IXR_Error( 401, __( 'Sorry, you do not have the right to publish this post.' ) );
+			}
 		}

 		if ( $post_more )
@@ -4906,10 +4948,13 @@ class wp_xmlrpc_server extends IXR_Server {

 		// Only posts can be sticky
 		if ( $post_type == 'post' && isset( $content_struct['sticky'] ) ) {
-			if ( $content_struct['sticky'] == true )
-				stick_post( $post_ID );
-			elseif ( $content_struct['sticky'] == false )
-				unstick_post( $post_ID );
+			$data = $newpost;
+			$data['sticky'] = $content_struct['sticky'];
+			$data['post_type'] = 'post';
+			$error = $this->_toggle_sticky( $data, true );
+			if ( $error ) {
+				return $error;
+			}
 		}

 		if ( isset($content_struct['custom_fields']) )
--- a/wp-includes/compat.php
+++ b/wp-includes/compat.php
@@ -13,23 +13,141 @@ if ( !function_exists('_') ) {
 	}
 }

-if ( !function_exists('mb_substr') ):
-	function mb_substr( $str, $start, $length=null, $encoding=null ) {
-		return _mb_substr($str, $start, $length, $encoding);
+/**
+ * Returns whether PCRE/u (PCRE_UTF8 modifier) is available for use.
+ *
+ * @ignore
+ * @since 4.2.2
+ * @access private
+ *
+ * @param bool $set - Used for testing only
+ *             null   : default - get PCRE/u capability
+ *             false  : Used for testing - return false for future calls to this function
+ *             'reset': Used for testing - restore default behavior of this function
+ */
+function _wp_can_use_pcre_u( $set = null ) {
+	static $utf8_pcre = 'reset';
+
+	if ( null !== $set ) {
+		$utf8_pcre = $set;
+	}
+
+	if ( 'reset' === $utf8_pcre ) {
+		$utf8_pcre = @preg_match( '/^./u', 'a' );
+	}
+
+	return $utf8_pcre;
+}
+
+if ( ! function_exists( 'mb_substr' ) ) :
+	function mb_substr( $str, $start, $length = null, $encoding = null ) {
+		return _mb_substr( $str, $start, $length, $encoding );
 	}
 endif;

-function _mb_substr( $str, $start, $length=null, $encoding=null ) {
-	// the solution below, works only for utf-8, so in case of a different
-	// charset, just use built-in substr
-	$charset = get_option( 'blog_charset' );
-	if ( !in_array( $charset, array('utf8', 'utf-8', 'UTF8', 'UTF-8') ) ) {
-		return is_null( $length )? substr( $str, $start ) : substr( $str, $start, $length);
+/*
+ * Only understands UTF-8 and 8bit.  All other character sets will be treated as 8bit.
+ * For $encoding === UTF-8, the $str input is expected to be a valid UTF-8 byte sequence.
+ * The behavior of this function for invalid inputs is undefined.
+ */
+function _mb_substr( $str, $start, $length = null, $encoding = null ) {
+	if ( null === $encoding ) {
+		$encoding = get_option( 'blog_charset' );
 	}
-	// use the regex unicode support to separate the UTF-8 characters into an array
-	preg_match_all( '/./us', $str, $match );
-	$chars = is_null( $length )? array_slice( $match[0], $start ) : array_slice( $match[0], $start, $length );
-	return implode( '', $chars );
+
+	// The solution below works only for UTF-8,
+	// so in case of a different charset just use built-in substr()
+	if ( ! in_array( $encoding, array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) ) ) {
+		return is_null( $length ) ? substr( $str, $start ) : substr( $str, $start, $length );
+	}
+
+	if ( _wp_can_use_pcre_u() ) {
+		// Use the regex unicode support to separate the UTF-8 characters into an array
+		preg_match_all( '/./us', $str, $match );
+		$chars = is_null( $length ) ? array_slice( $match[0], $start ) : array_slice( $match[0], $start, $length );
+		return implode( '', $chars );
+	}
+
+	$regex = '/(
+		  [\x00-\x7F]                  # single-byte sequences   0xxxxxxx
+		| [\xC2-\xDF][\x80-\xBF]       # double-byte sequences   110xxxxx 10xxxxxx
+		| \xE0[\xA0-\xBF][\x80-\xBF]   # triple-byte sequences   1110xxxx 10xxxxxx * 2
+		| [\xE1-\xEC][\x80-\xBF]{2}
+		| \xED[\x80-\x9F][\x80-\xBF]
+		| [\xEE-\xEF][\x80-\xBF]{2}
+		| \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences   11110xxx 10xxxxxx * 3
+		| [\xF1-\xF3][\x80-\xBF]{3}
+		| \xF4[\x80-\x8F][\x80-\xBF]{2}
+	)/x';
+
+	$chars = array( '' ); // Start with 1 element instead of 0 since the first thing we do is pop
+	do {
+		// We had some string left over from the last round, but we counted it in that last round.
+		array_pop( $chars );
+
+		// Split by UTF-8 character, limit to 1000 characters (last array element will contain the rest of the string)
+		$pieces = preg_split( $regex, $str, 1000, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY );
+
+		$chars = array_merge( $chars, $pieces );
+	} while ( count( $pieces ) > 1 && $str = array_pop( $pieces ) ); // If there's anything left over, repeat the loop.
+
+	return join( '', array_slice( $chars, $start, $length ) );
+}
+
+if ( ! function_exists( 'mb_strlen' ) ) :
+	function mb_strlen( $str, $encoding = null ) {
+		return _mb_strlen( $str, $encoding );
+	}
+endif;
+
+/*
+ * Only understands UTF-8 and 8bit.  All other character sets will be treated as 8bit.
+ * For $encoding === UTF-8, the $str input is expected to be a valid UTF-8 byte sequence.
+ * The behavior of this function for invalid inputs is undefined.
+ */
+function _mb_strlen( $str, $encoding = null ) {
+	if ( null === $encoding ) {
+		$encoding = get_option( 'blog_charset' );
+	}
+
+	// The solution below works only for UTF-8,
+	// so in case of a different charset just use built-in strlen()
+	if ( ! in_array( $encoding, array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) ) ) {
+		return strlen( $str );
+	}
+
+	if ( _wp_can_use_pcre_u() ) {
+		// Use the regex unicode support to separate the UTF-8 characters into an array
+		preg_match_all( '/./us', $str, $match );
+		return count( $match[0] );
+	}
+
+	$regex = '/(?:
+		  [\x00-\x7F]                  # single-byte sequences   0xxxxxxx
+		| [\xC2-\xDF][\x80-\xBF]       # double-byte sequences   110xxxxx 10xxxxxx
+		| \xE0[\xA0-\xBF][\x80-\xBF]   # triple-byte sequences   1110xxxx 10xxxxxx * 2
+		| [\xE1-\xEC][\x80-\xBF]{2}
+		| \xED[\x80-\x9F][\x80-\xBF]
+		| [\xEE-\xEF][\x80-\xBF]{2}
+		| \xF0[\x90-\xBF][\x80-\xBF]{2} # four-byte sequences   11110xxx 10xxxxxx * 3
+		| [\xF1-\xF3][\x80-\xBF]{3}
+		| \xF4[\x80-\x8F][\x80-\xBF]{2}
+	)/x';
+
+	$count = 1; // Start at 1 instead of 0 since the first thing we do is decrement
+	do {
+		// We had some string left over from the last round, but we counted it in that last round.
+		$count--;
+
+		// Split by UTF-8 character, limit to 1000 characters (last array element will contain the rest of the string)
+		$pieces = preg_split( $regex, $str, 1000 );
+
+		// Increment
+		$count += count( $pieces );
+	} while ( $str = array_pop( $pieces ) ); // If there's anything left over, repeat the loop.
+
+	// Fencepost: preg_split() always returns one extra item in the array
+	return --$count;
 }

 if ( !function_exists('hash_hmac') ):
@@ -94,3 +212,32 @@ if ( !function_exists('json_decode') ) {
 		return is_array($data) ? array_map(__FUNCTION__, $data) : $data;
 	}
 }
+
+if ( ! function_exists( 'hash_equals' ) ) :
+/**
+ * Compare two strings in constant time.
+ *
+ * This function was added in PHP 5.6.
+ * It can leak the length of a string.
+ *
+ * @since 3.9.2
+ *
+ * @param string $a Expected string.
+ * @param string $b Actual string.
+ * @return bool Whether strings are equal.
+ */
+function hash_equals( $a, $b ) {
+	$a_length = strlen( $a );
+	if ( $a_length !== strlen( $b ) ) {
+		return false;
+	}
+	$result = 0;
+
+	// Do not attempt to "optimize" this.
+	for ( $i = 0; $i < $a_length; $i++ ) {
+		$result |= ord( $a[ $i ] ) ^ ord( $b[ $i ] );
+	}
+
+	return $result === 0;
+}
+endif;
--- a/wp-includes/default-widgets.php
+++ b/wp-includes/default-widgets.php
@@ -1343,7 +1343,7 @@ class WP_Widget_Tag_Cloud extends WP_Widget {
 		?>
 		<p>
 			<label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:') ?></label>
-			<input type="text" class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" value="<?php echo $title; ?>" />
+			<input type="text" class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" value="<?php echo esc_attr( $title ); ?>" />
 		</p>
 		<p>
 			<label for="<?php echo $this->get_field_id('nav_menu'); ?>"><?php _e('Select Menu:'); ?></label>
--- a/wp-includes/formatting.php
+++ b/wp-includes/formatting.php
@@ -152,7 +152,14 @@ function wptexturize($text) {
 	$no_texturize_tags_stack = array();
 	$no_texturize_shortcodes_stack = array();

-	$textarr = preg_split('/(<.*>|\[.*\])/Us', $text, -1, PREG_SPLIT_DELIM_CAPTURE);
+	// Look for shortcodes and HTML elements.
+	
+	$shortcode_regex =
+		  '\['          // Find start of shortcode.
+		. '[^\[\]<>]++' // Shortcodes do not contain other shortcodes. Possessive critical.
+		. '\]';         // Find end of shortcode.
+
+	$textarr = preg_split("/(<[^>]*>|$shortcode_regex)/s", $text, -1, PREG_SPLIT_DELIM_CAPTURE);

 	foreach ( $textarr as &$curl ) {
 		if ( empty( $curl ) ) {
@@ -163,7 +170,7 @@ function wptexturize($text) {
 		$first = $curl[0];
 		if ( '<' === $first ) {
 			_wptexturize_pushpop_element($curl, $no_texturize_tags_stack, $no_texturize_tags, '<', '>');
-		} elseif ( '[' === $first ) {
+		} elseif ( '[' === $first && 1 === preg_match( '/^' . $shortcode_regex . '$/', $curl ) ) {
 			_wptexturize_pushpop_element($curl, $no_texturize_shortcodes_stack, $no_texturize_shortcodes, '[', ']');
 		} elseif ( empty($no_texturize_shortcodes_stack) && empty($no_texturize_tags_stack) ) {

@@ -214,6 +221,8 @@ function _wptexturize_pushpop_element($text, &$stack, $disabled_elements, $openi

 			array_push($stack, $matches[1]);
 		}
+	} elseif ( 0 == count( $stack ) ) {
+		// Stack is empty. Just stop.
 	} else {
 		// Closing? Check $text+2 against disabled elements
 		$c = preg_quote($closing, '/');
@@ -282,6 +291,9 @@ function wpautop($pee, $br = true) {
 	$pee = preg_replace('!(</' . $allblocks . '>)!', "$1\n\n", $pee);
 	$pee = str_replace(array("\r\n", "\r"), "\n", $pee); // cross-platform newlines

+	// Find newlines in all elements and add placeholders.
+	$pee = wp_replace_in_html_tags( $pee, array( "\n" => " <!-- wpnl --> " ) );
+
 	if ( strpos( $pee, '</object>' ) !== false ) {
 		// no P/BR around param and embed
 		$pee = preg_replace( '|(<object[^>]*>)\s*|', '$1', $pee );
@@ -327,9 +339,109 @@ function wpautop($pee, $br = true) {
 	if ( !empty($pre_tags) )
 		$pee = str_replace(array_keys($pre_tags), array_values($pre_tags), $pee);

+	// Restore newlines in all elements.
+	$pee = str_replace( " <!-- wpnl --> ", "\n", $pee );
+
 	return $pee;
 }

+/**
+ * Separate HTML elements and comments from the text.
+ *
+ * @since 4.2.4
+ *
+ * @param string $input The text which has to be formatted.
+ * @return array The formatted text.
+ */
+function wp_html_split( $input ) {
+	static $regex;
+
+	if ( ! isset( $regex ) ) {
+		$comments =
+			  '!'           // Start of comment, after the <.
+			. '(?:'         // Unroll the loop: Consume everything until --> is found.
+			.     '-(?!->)' // Dash not followed by end of comment.
+			.     '[^\-]*+' // Consume non-dashes.
+			. ')*+'         // Loop possessively.
+			. '(?:-->)?';   // End of comment. If not found, match all input.
+
+		$cdata =
+			  '!\[CDATA\['  // Start of comment, after the <.
+			. '[^\]]*+'     // Consume non-].
+			. '(?:'         // Unroll the loop: Consume everything until ]]> is found.
+			.     '](?!]>)' // One ] not followed by end of comment.
+			.     '[^\]]*+' // Consume non-].
+			. ')*+'         // Loop possessively.
+			. '(?:]]>)?';   // End of comment. If not found, match all input.
+
+		$regex =
+			  '/('              // Capture the entire match.
+			.     '<'           // Find start of element.
+			.     '(?(?=!--)'   // Is this a comment?
+			.         $comments // Find end of comment.
+			.     '|'
+			.         '(?(?=!\[CDATA\[)' // Is this a comment?
+			.             $cdata // Find end of comment.
+			.         '|'
+			.             '[^>]*>?' // Find end of element. If not found, match all input.
+			.         ')'
+			.     ')'
+			. ')/s';
+	}
+
+	return preg_split( $regex, $input, -1, PREG_SPLIT_DELIM_CAPTURE );
+}
+
+/**
+ * Replace characters or phrases within HTML elements only.
+ *
+ * @since 4.2.3
+ *
+ * @param string $haystack The text which has to be formatted.
+ * @param array $replace_pairs In the form array('from' => 'to', ...).
+ * @return string The formatted text.
+ */
+function wp_replace_in_html_tags( $haystack, $replace_pairs ) {
+	// Find all elements.
+	$textarr = wp_html_split( $haystack );
+	$changed = false;
+
+	// Optimize when searching for one item.
+	if ( 1 === count( $replace_pairs ) ) {
+		// Extract $needle and $replace.
+		foreach ( $replace_pairs as $needle => $replace );
+
+		// Loop through delimeters (elements) only.
+		for ( $i = 1, $c = count( $textarr ); $i < $c; $i += 2 ) { 
+			if ( false !== strpos( $textarr[$i], $needle ) ) {
+				$textarr[$i] = str_replace( $needle, $replace, $textarr[$i] );
+				$changed = true;
+			}
+		}
+	} else {
+		// Extract all $needles.
+		$needles = array_keys( $replace_pairs );
+
+		// Loop through delimeters (elements) only.
+		for ( $i = 1, $c = count( $textarr ); $i < $c; $i += 2 ) { 
+			foreach ( $needles as $needle ) {
+				if ( false !== strpos( $textarr[$i], $needle ) ) {
+					$textarr[$i] = strtr( $textarr[$i], $replace_pairs );
+					$changed = true;
+					// After one strtr() break out of the foreach loop and look at next element.
+					break;
+				}
+			}
+		}
+	}
+
+	if ( $changed ) {
+		$haystack = implode( $textarr );
+	}
+
+	return $haystack;
+}
+
 /**
 * Newline preservation help function for wpautop
 *
@@ -912,7 +1024,8 @@ function remove_accents($string) {
 * operating systems and special characters requiring special escaping
 * to manipulate at the command line. Replaces spaces and consecutive
 * dashes with a single dash. Trims period, dash and underscore from beginning
- * and end of filename.
+ * and end of filename. It is not guaranteed that this function will return a
+ * filename that is allowed to be uploaded.
 *
 * @since 2.1.0
 *
@@ -936,6 +1049,14 @@ function sanitize_file_name( $filename ) {
 	$filename = preg_replace('/[\s-]+/', '-', $filename);
 	$filename = trim($filename, '.-_');

+	if ( false === strpos( $filename, '.' ) ) {
+		$mime_types = wp_get_mime_types();
+		$filetype = wp_check_filetype( 'test.' . $filename, $mime_types );
+		if ( $filetype['ext'] === $filename ) {
+			$filename = 'unnamed-file.' . $filetype['ext'];
+		}
+	}
+
 	// Split the filename into a base and extension[s]
 	$parts = explode('.', $filename);

@@ -1169,21 +1290,23 @@ function sanitize_title_with_dashes( $title, $raw_title = '', $context = 'displa
 }

 /**
- * Ensures a string is a valid SQL order by clause.
+ * Ensures a string is a valid SQL 'order by' clause.
 *
- * Accepts one or more columns, with or without ASC/DESC, and also accepts
- * RAND().
+ * Accepts one or more columns, with or without a sort order (ASC / DESC).
+ * e.g. 'column_1', 'column_1, column_2', 'column_1 ASC, column_2 DESC' etc.
+ *
+ * Also accepts 'RAND()'.
 *
 * @since 2.5.1
 *
- * @param string $orderby Order by string to be checked.
- * @return string|bool Returns the order by clause if it is a match, false otherwise.
+ * @param string $orderby Order by clause to be validated.
+ * @return string|bool Returns $orderby if valid, false otherwise.
 */
-function sanitize_sql_orderby( $orderby ){
-	preg_match('/^\s*([a-z0-9_]+(\s+(ASC|DESC))?(\s*,\s*|\s*$))+|^\s*RAND\(\s*\)\s*$/i', $orderby, $obmatches);
-	if ( !$obmatches )
-		return false;
-	return $orderby;
+function sanitize_sql_orderby( $orderby ) {
+	if ( preg_match( '/^\s*(([a-z0-9_]+|`[a-z0-9_]+`)(\s+(ASC|DESC))?\s*(,\s*(?=[a-z0-9_`])|$))+$/i', $orderby ) || preg_match( '/^\s*RAND\(\s*\)\s*$/i', $orderby ) ) {
+		return $orderby;
+	}
+	return false;
 }

 /**
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -1977,7 +1977,7 @@ function wp_check_filetype( $filename, $mimes = null ) {
 * If it's determined that the extension does not match the file's real type,
 * then the "proper_filename" value will be set with a proper filename and extension.
 *
- * Currently this function only supports validating images known to getimagesize().
+ * Currently this function only supports renaming images validated via wp_get_image_mime().
 *
 * @since 3.0.0
 *
@@ -1998,14 +1998,15 @@ function wp_check_filetype_and_ext( $file, $filename, $mimes = null ) {
 	if ( ! file_exists( $file ) )
 		return compact( 'ext', 'type', 'proper_filename' );

-	// We're able to validate images using GD
-	if ( $type && 0 === strpos( $type, 'image/' ) && function_exists('getimagesize') ) {
+	// Validate image types.
+	if ( $type && 0 === strpos( $type, 'image/' ) ) {

 		// Attempt to figure out what type of image it actually is
-		$imgstats = @getimagesize( $file );
+		$real_mime = wp_get_image_mime( $file );

-		// If getimagesize() knows what kind of image it really is and if the real MIME doesn't match the claimed MIME
-		if ( !empty($imgstats['mime']) && $imgstats['mime'] != $type ) {
+		if ( ! $real_mime ) {
+			$type = $ext = false;
+		} elseif ( $real_mime != $type ) {
 			/**
 			 * Filter the list mapping image mime types to their respective extensions.
 			 *
@@ -2022,10 +2023,10 @@ function wp_check_filetype_and_ext( $file, $filename, $mimes = null ) {
 			) );

 			// Replace whatever is after the last period in the filename with the correct extension
-			if ( ! empty( $mime_to_ext[ $imgstats['mime'] ] ) ) {
+			if ( ! empty( $mime_to_ext[ $real_mime ] ) ) {
 				$filename_parts = explode( '.', $filename );
 				array_pop( $filename_parts );
-				$filename_parts[] = $mime_to_ext[ $imgstats['mime'] ];
+				$filename_parts[] = $mime_to_ext[ $real_mime ];
 				$new_filename = implode( '.', $filename_parts );

 				if ( $new_filename != $filename )
@@ -2034,8 +2035,20 @@ function wp_check_filetype_and_ext( $file, $filename, $mimes = null ) {
 				// Redefine the extension / MIME
 				$wp_filetype = wp_check_filetype( $new_filename, $mimes );
 				extract( $wp_filetype );
+			} else {
+				$type = $ext = false;
 			}
 		}
+	} elseif ( function_exists( 'finfo_file' ) ) {
+		// Use finfo_file if available to validate non-image files.
+		$finfo = finfo_open( FILEINFO_MIME_TYPE );
+		$real_mime = finfo_file( $finfo, $file );
+		finfo_close( $finfo );
+
+		// If the extension does not match the file's real type, return false.
+		if ( $real_mime !== $type ) {
+			$type = $ext = false;
+		}
 	}

 	/**
@@ -2053,6 +2066,38 @@ function wp_check_filetype_and_ext( $file, $filename, $mimes = null ) {
 	return apply_filters( 'wp_check_filetype_and_ext', compact( 'ext', 'type', 'proper_filename' ), $file, $filename, $mimes );
 }

+/**
+ * Returns the real mime type of an image file.
+ *
+ * This depends on exif_imagetype() or getimagesize() to determine real mime types.
+ *
+ * @since 4.7.1
+ *
+ * @param string $file Full path to the file.
+ * @return string|false The actual mime type or false if the type cannot be determined.
+ */
+function wp_get_image_mime( $file ) {
+	/*
+	 * Use exif_imagetype() to check the mimetype if available or fall back to
+	 * getimagesize() if exif isn't avaialbe. If either function throws an Exception
+	 * we assume the file could not be validated.
+	 */
+	try {
+		if ( is_callable( 'exif_imagetype' ) ) {
+			$mime = image_type_to_mime_type( exif_imagetype( $file ) );
+		} elseif ( function_exists( 'getimagesize' ) ) {
+			$imagesize = getimagesize( $file );
+			$mime = ( isset( $imagesize['mime'] ) ) ? $imagesize['mime'] : false;
+		} else {
+			$mime = false;
+		}
+	} catch ( Exception $e ) {
+		$mime = false;
+	}
+
+	return $mime;
+}
+
 /**
 * Retrieve list of mime types and file extensions.
 *
--- a/wp-includes/http.php
+++ b/wp-includes/http.php
@@ -451,8 +451,9 @@ function send_origin_headers() {
 * @return mixed URL or false on failure.
 */
 function wp_http_validate_url( $url ) {
+	$original_url = $url;
 	$url = wp_kses_bad_protocol( $url, array( 'http', 'https' ) );
-	if ( ! $url )
+	if ( ! $url || strtolower( $url ) !== strtolower( $original_url ) )
 		return false;

 	$parsed_url = @parse_url( $url );
@@ -462,7 +463,7 @@ function wp_http_validate_url( $url ) {
 	if ( isset( $parsed_url['user'] ) || isset( $parsed_url['pass'] ) )
 		return false;

-	if ( false !== strpos( $parsed_url['host'], ':' ) )
+	if ( false !== strpbrk( $parsed_url['host'], ':#?[]' ) )
 		return false;

 	$parsed_home = @parse_url( get_option( 'home' ) );
@@ -471,7 +472,7 @@ function wp_http_validate_url( $url ) {

 	if ( ! $same_host ) {
 		$host = trim( $parsed_url['host'], '.' );
-		if ( preg_match( '#^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$#', $host ) ) {
+		if ( preg_match( '#^(([1-9]?\d|1\d\d|25[0-5]|2[0-4]\d)\.){3}([1-9]?\d|1\d\d|25[0-5]|2[0-4]\d)$#', $host ) ) {
 			$ip = $host;
 		} else {
 			$ip = gethostbyname( $host );
@@ -480,8 +481,7 @@ function wp_http_validate_url( $url ) {
 		}
 		if ( $ip ) {
 			$parts = array_map( 'intval', explode( '.', $ip ) );
-			if ( '127.0.0.1' === $ip
-				|| ( 10 === $parts[0] )
+			if ( 127 === $parts[0] || 10 === $parts[0] || 0 === $parts[0]
 				|| ( 172 === $parts[0] && 16 <= $parts[1] && 31 >= $parts[1] )
 				|| ( 192 === $parts[0] && 168 === $parts[1] )
 			) {
--- a/wp-includes/js/plupload/plupload.flash.swf
+++ b/wp-includes/js/plupload/plupload.flash.swf
--- a/wp-includes/js/tinymce/plugins/wordpress/plugin.js
+++ b/wp-includes/js/tinymce/plugins/wordpress/plugin.js
@@ -91,6 +91,10 @@ tinymce.PluginManager.add( 'wordpress', function( editor ) {
 					'<img src="' + tinymce.Env.transparentSrc + '" class="wp-more-tag mce-wp-nextpage" ' +
 						'title="Page break" data-mce-resize="false" data-mce-placeholder="1" />' );
 			}
+
+			if ( e.content.indexOf( '<?"' ) !== -1 ) {
+				e.content = e.content.replace( /<\?"/g, '' );
+			}
 		}
 	});

--- a/wp-includes/js/tinymce/plugins/wordpress/plugin.min.js
+++ b/wp-includes/js/tinymce/plugins/wordpress/plugin.min.js
--- a/wp-includes/js/tinymce/plugins/wpeditimage/plugin.js
+++ b/wp-includes/js/tinymce/plugins/wpeditimage/plugin.js
@@ -1,6 +1,7 @@
 /* global tinymce */
 tinymce.PluginManager.add( 'wpeditimage', function( editor ) {
-	var toolbarActive = false;
+	var serializer,
+		toolbarActive = false;

 	function parseShortcode( content ) {
 		return content.replace( /(?:<p>)?\[(?:wp_)?caption([^\]]+)\]([\s\S]+?)\[\/(?:wp_)?caption\](?:<\/p>)?/g, function( a, b, c ) {
@@ -208,6 +209,19 @@ tinymce.PluginManager.add( 'wpeditimage', function( editor ) {
 		return node && !! ( node.textContent || node.innerText );
 	}

+	// Verify HTML in captions
+	function verifyHTML( caption ) {
+		if ( ! caption || ( caption.indexOf( '<' ) === -1 && caption.indexOf( '>' ) === -1 ) ) {
+			return caption;
+		}
+
+		if ( ! serializer ) {
+			serializer = new tinymce.html.Serializer( {}, editor.schema );
+		}
+
+		return serializer.serialize( editor.parser.parse( caption, { forced_root_block: false } ) );
+	}
+
 	function updateImage( imageNode, imageData ) {
 		var classes, className, node, html, parent, wrap, linkNode,
 			captionNode, dd, dl, id, attrs, linkAttrs, width, height,
@@ -285,6 +299,7 @@ tinymce.PluginManager.add( 'wpeditimage', function( editor ) {
 		}

 		if ( imageData.caption ) {
+			imageData.caption = verifyHTML( imageData.caption );

 			id = imageData.attachment_id ? 'attachment_' + imageData.attachment_id : null;
 			className = 'wp-caption align' + ( imageData.align || 'none' );
@@ -563,6 +578,7 @@ tinymce.PluginManager.add( 'wpeditimage', function( editor ) {

 				// Convert remaining line breaks to <br>
 				caption = caption.replace( /(<br[^>]*>)\s*\n\s*/g, '$1' ).replace( /\s*\n\s*/g, '<br />' );
+				caption = verifyHTML( caption );
 			}

 			if ( ! imgNode ) {
--- a/wp-includes/js/tinymce/plugins/wpeditimage/plugin.min.js
+++ b/wp-includes/js/tinymce/plugins/wpeditimage/plugin.min.js
--- a/wp-includes/js/tinymce/wp-tinymce.js.gz
+++ b/wp-includes/js/tinymce/wp-tinymce.js.gz
--- a/wp-includes/kses.php
+++ b/wp-includes/kses.php
@@ -489,6 +489,82 @@ function wp_kses( $string, $allowed_html, $allowed_protocols = array() ) {
 	return wp_kses_split($string, $allowed_html, $allowed_protocols);
 }

+/**
+ * Filters one attribute only and ensures its value is allowed.
+ *
+ * This function has the advantage of being more secure than esc_attr() and can
+ * escape data in some situations where wp_kses() must strip the whole attribute.
+ *
+ * @since 4.2.3
+ *
+ * @param string $string The 'whole' attribute, including name and value.
+ * @param string $element The element name to which the attribute belongs.
+ * @return string Filtered attribute.
+ */
+function wp_kses_one_attr( $string, $element ) {
+	$uris = array('xmlns', 'profile', 'href', 'src', 'cite', 'classid', 'codebase', 'data', 'usemap', 'longdesc', 'action');
+	$allowed_html = wp_kses_allowed_html( 'post' );
+	$allowed_protocols = wp_allowed_protocols();
+	$string = wp_kses_no_null( $string, array( 'slash_zero' => 'keep' ) );
+	$string = wp_kses_js_entities( $string );
+	$string = wp_kses_normalize_entities( $string );
+
+	// Preserve leading and trailing whitespace.
+	$matches = array();
+	preg_match('/^\s*/', $string, $matches);
+	$lead = $matches[0];
+	preg_match('/\s*$/', $string, $matches);
+	$trail = $matches[0];
+	if ( empty( $trail ) ) {
+		$string = substr( $string, strlen( $lead ) );
+	} else {
+		$string = substr( $string, strlen( $lead ), -strlen( $trail ) );
+	}
+	
+	// Parse attribute name and value from input.
+	$split = preg_split( '/\s*=\s*/', $string, 2 );
+	$name = $split[0];
+	if ( count( $split ) == 2 ) {
+		$value = $split[1];
+
+		// Remove quotes surrounding $value.
+		// Also guarantee correct quoting in $string for this one attribute.
+		if ( '' == $value ) {
+			$quote = '';
+		} else {
+			$quote = $value[0];
+		}
+		if ( '"' == $quote || "'" == $quote ) {
+			if ( substr( $value, -1 ) != $quote ) {
+				return '';
+			}
+			$value = substr( $value, 1, -1 );
+		} else {
+			$quote = '"';
+		}
+
+		// Sanitize quotes and angle braces.
+		$value = htmlspecialchars( $value, ENT_QUOTES, null, false );
+
+		// Sanitize URI values.
+		if ( in_array( strtolower( $name ), $uris ) ) {
+			$value = wp_kses_bad_protocol( $value, $allowed_protocols );
+		}
+
+		$string = "$name=$quote$value$quote";
+		$vless = 'n';
+	} else {
+		$value = '';
+		$vless = 'y';
+	}
+	
+	// Sanitize attribute by name.
+	wp_kses_attr_check( $name, $value, $string, $vless, $element, $allowed_html );
+
+	// Restore whitespace.
+	return $lead . $string . $trail;
+}
+
 /**
 * Return a list of allowed tags and attributes for a given context.
 *
@@ -710,45 +786,11 @@ function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols) {
 	# Go through $attrarr, and save the allowed attributes for this element
 	# in $attr2
 	$attr2 = '';
-
-	$allowed_attr = $allowed_html[strtolower($element)];
-	foreach ($attrarr as $arreach) {
-		if ( ! isset( $allowed_attr[strtolower($arreach['name'])] ) )
-			continue; # the attribute is not allowed
-
-		$current = $allowed_attr[strtolower($arreach['name'])];
-		if ( $current == '' )
-			continue; # the attribute is not allowed
-
-		if ( strtolower( $arreach['name'] ) == 'style' ) {
-			$orig_value = $arreach['value'];
-			$value = safecss_filter_attr( $orig_value );
-
-			if ( empty( $value ) )
-				continue;
-
-			$arreach['value'] = $value;
-			$arreach['whole'] = str_replace( $orig_value, $value, $arreach['whole'] );
-		}
-
-		if ( ! is_array($current) ) {
+	foreach ( $attrarr as $arreach ) {
+		if ( wp_kses_attr_check( $arreach['name'], $arreach['value'], $arreach['whole'], $arreach['vless'], $element, $allowed_html ) ) {
 			$attr2 .= ' '.$arreach['whole'];
-		# there are no checks
-
-		} else {
-			# there are some checks
-			$ok = true;
-			foreach ($current as $currkey => $currval) {
-				if ( ! wp_kses_check_attr_val($arreach['value'], $arreach['vless'], $currkey, $currval) ) {
-					$ok = false;
-					break;
-				}
-			}
-
-			if ( $ok )
-				$attr2 .= ' '.$arreach['whole']; # it passed them
-		} # if !is_array($current)
-	} # foreach
+		}
+	}

 	# Remove any "<" or ">" characters
 	$attr2 = preg_replace('/[<>]/', '', $attr2);
@@ -756,6 +798,53 @@ function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols) {
 	return "<$element$attr2$xhtml_slash>";
 }

+/**
+ * Determine whether an attribute is allowed.
+ *
+ * @since 4.2.3
+ *
+ * @param string $name The attribute name. Returns empty string when not allowed.
+ * @param string $value The attribute value. Returns a filtered value.
+ * @param string $whole The name=value input. Returns filtered input.
+ * @param string $vless 'y' when attribute like "enabled", otherwise 'n'.
+ * @param string $element The name of the element to which this attribute belongs.
+ * @param array $allowed_html The full list of allowed elements and attributes.
+ * @return bool Is the attribute allowed?
+ */
+function wp_kses_attr_check( &$name, &$value, &$whole, $vless, $element, $allowed_html ) {
+	$allowed_attr = $allowed_html[strtolower( $element )];
+
+	$name_low = strtolower( $name );
+	if ( ! isset( $allowed_attr[$name_low] ) || '' == $allowed_attr[$name_low] ) {
+		$name = $value = $whole = '';
+		return false;
+	}
+
+	if ( 'style' == $name_low ) {
+		$new_value = safecss_filter_attr( $value );
+
+		if ( empty( $new_value ) ) {
+			$name = $value = $whole = '';
+			return false;
+		}
+
+		$whole = str_replace( $value, $new_value, $whole );
+		$value = $new_value;
+	}
+
+	if ( is_array( $allowed_attr[$name_low] ) ) {
+		// there are some checks
+		foreach ( $allowed_attr[$name_low] as $currkey => $currval ) {
+			if ( ! wp_kses_check_attr_val( $value, $vless, $currkey, $currval ) ) {
+				$name = $value = $whole = '';
+				return false;
+			}
+		}
+	}
+
+	return true;
+}
+
 /**
 * Builds an attribute list from string containing attributes.
 *
@@ -885,6 +974,109 @@ function wp_kses_hair($attr, $allowed_protocols) {
 	return $attrarr;
 }

+/**
+ * Finds all attributes of an HTML element.
+ *
+ * Does not modify input.  May return "evil" output.
+ *
+ * Based on wp_kses_split2() and wp_kses_attr()
+ *
+ * @since 4.2.3
+ *
+ * @param string $element HTML element/tag
+ * @return array|bool List of attributes found in $element. Returns false on failure.
+ */
+function wp_kses_attr_parse( $element ) {
+	$valid = preg_match('%^(<\s*)(/\s*)?([a-zA-Z0-9]+\s*)([^>]*)(>?)$%', $element, $matches);
+	if ( 1 !== $valid ) {
+		return false;
+	}
+
+	$begin =  $matches[1];
+	$slash =  $matches[2];
+	$elname = $matches[3];
+	$attr =   $matches[4];
+	$end =    $matches[5];
+
+	if ( '' !== $slash ) {
+		// Closing elements do not get parsed.
+		return false;
+	}
+
+	// Is there a closing XHTML slash at the end of the attributes?
+	if ( 1 === preg_match( '%\s*/\s*$%', $attr, $matches ) ) {
+		$xhtml_slash = $matches[0];
+		$attr = substr( $attr, 0, -strlen( $xhtml_slash ) );
+	} else {
+		$xhtml_slash = '';
+	}
+	
+	// Split it
+	$attrarr = wp_kses_hair_parse( $attr );
+	if ( false === $attrarr ) {
+		return false;
+	}
+
+	// Make sure all input is returned by adding front and back matter.
+	array_unshift( $attrarr, $begin . $slash . $elname );
+	array_push( $attrarr, $xhtml_slash . $end );
+	
+	return $attrarr;
+}
+
+/**
+ * Builds an attribute list from string containing attributes.
+ *
+ * Does not modify input.  May return "evil" output.
+ * In case of unexpected input, returns false instead of stripping things.
+ *
+ * Based on wp_kses_hair() but does not return a multi-dimensional array.
+ *
+ * @since 4.2.3
+ *
+ * @param string $attr Attribute list from HTML element to closing HTML element tag
+ * @return array|bool List of attributes found in $attr. Returns false on failure.
+ */
+function wp_kses_hair_parse( $attr ) {
+	if ( '' === $attr ) {
+		return array();
+	}
+
+	$regex =
+	  '(?:'
+	.     '[-a-zA-Z:]+'   // Attribute name.
+	. '|'
+	.     '\[\[?[^\[\]]+\]\]?' // Shortcode in the name position implies unfiltered_html.
+	. ')'
+	. '(?:'               // Attribute value.
+	.     '\s*=\s*'       // All values begin with '='
+	.     '(?:'
+	.         '"[^"]*"'   // Double-quoted
+	.     '|'
+	.         "'[^']*'"   // Single-quoted
+	.     '|'
+	.         '[^\s"\']+' // Non-quoted
+	.         '(?:\s|$)'  // Must have a space
+	.     ')'
+	. '|'
+	.     '(?:\s|$)'      // If attribute has no value, space is required.
+	. ')'
+	. '\s*';              // Trailing space is optional except as mentioned above.
+
+	// Although it is possible to reduce this procedure to a single regexp,
+	// we must run that regexp twice to get exactly the expected result.
+
+	$validation = "%^($regex)+$%";
+	$extraction = "%$regex%";
+
+	if ( 1 === preg_match( $validation, $attr ) ) {
+		preg_match_all( $extraction, $attr, $attrarr );
+		return $attrarr[0];
+	} else {
+		return false;
+	}
+}
+
 /**
 * Performs different checks for attribute values.
 *
@@ -1434,7 +1626,7 @@ function safecss_filter_attr( $css, $deprecated = '' ) {
 	$css = wp_kses_no_null($css);
 	$css = str_replace(array("\n","\r","\t"), '', $css);

-	if ( preg_match( '%[\\(&=}]|/\*%', $css ) ) // remove any inline css containing \ ( & } = or comments
+	if ( preg_match( '%[\\\\(&=}]|/\*%', $css ) ) // remove any inline css containing \ ( & } = or comments
 		return '';

 	$css_array = explode( ';', trim( $css ) );
--- a/wp-includes/media.php
+++ b/wp-includes/media.php
@@ -801,6 +801,8 @@ function img_caption_shortcode( $attr, $content = null ) {
 			$content = $matches[1];
 			$attr['caption'] = trim( $matches[2] );
 		}
+	} elseif ( strpos( $attr['caption'], '<' ) !== false ) {
+		$attr['caption'] = wp_kses( $attr['caption'], 'post' );
 	}

 	/**
@@ -1215,6 +1217,10 @@ function wp_playlist_shortcode( $attr ) {
 		$orderby = 'none';
 	}

+	if ( $atts['type'] !== 'audio' ) {
+		$atts['type'] = 'video';
+	}
+
 	$args = array(
 		'post_status' => 'inherit',
 		'post_type' => 'attachment',
--- a/wp-includes/ms-functions.php
+++ b/wp-includes/ms-functions.php
@@ -725,7 +725,7 @@ function wpmu_validate_blog_signup( $blogname, $blog_title, $user = '' ) {
 function wpmu_signup_blog( $domain, $path, $title, $user, $user_email, $meta = array() )  {
 	global $wpdb;

-	$key = substr( md5( time() . rand() . $domain ), 0, 16 );
+	$key = substr( md5( time() . wp_rand() . $domain ), 0, 16 );
 	$meta = serialize($meta);

 	$wpdb->insert( $wpdb->signups, array(
@@ -761,7 +761,7 @@ function wpmu_signup_user( $user, $user_email, $meta = array() ) {
 	// Format data
 	$user = preg_replace( '/\s+/', '', sanitize_user( $user, true ) );
 	$user_email = sanitize_email( $user_email );
-	$key = substr( md5( time() . rand() . $user_email ), 0, 16 );
+	$key = substr( md5( time() . wp_rand() . $user_email ), 0, 16 );
 	$meta = serialize($meta);

 	$wpdb->insert( $wpdb->signups, array(
--- a/wp-includes/pluggable.php
+++ b/wp-includes/pluggable.php
@@ -647,7 +647,7 @@ function wp_validate_auth_cookie($cookie = '', $scheme = '') {
 	$key = wp_hash($username . $pass_frag . '|' . $expiration, $scheme);
 	$hash = hash_hmac('md5', $username . '|' . $expiration, $key);

-	if ( hash_hmac( 'md5', $hmac, $key ) !== hash_hmac( 'md5', $hash, $key ) ) {
+	if ( ! hash_equals( $hash, $hmac ) ) {
 		/**
 		 * Fires if a bad authentication cookie hash is encountered.
 		 *
@@ -950,18 +950,14 @@ function auth_redirect() {
 		}
 	}

-	if ( is_user_admin() ) {
-		$scheme = 'logged_in';
-	} else {
-		/**
-		 * Filter the authentication redirect scheme.
-		 *
-		 * @since 2.9.0
-		 *
-		 * @param string $scheme Authentication redirect scheme. Default empty.
-		 */
-		$scheme = apply_filters( 'auth_redirect_scheme', '' );
-	}
+	/**
+	 * Filters the authentication redirect scheme.
+	 *
+	 * @since 2.9.0
+	 *
+	 * @param string $scheme Authentication redirect scheme. Default empty.
+	 */
+	$scheme = apply_filters( 'auth_redirect_scheme', '' );

 	if ( $user_id = wp_validate_auth_cookie( '',  $scheme) ) {
 		/**
@@ -1189,7 +1185,7 @@ if ( !function_exists('wp_validate_redirect') ) :
 * @return string redirect-sanitized URL
 **/
 function wp_validate_redirect($location, $default = '') {
-	$location = trim( $location );
+	$location = trim( $location, " \t\n\r\0\x08\x0B" );
 	// browsers will assume 'http' is your protocol, and will obey a redirect to a URL starting with '//'
 	if ( substr($location, 0, 2) == '//' )
 		$location = 'http:' . $location;
@@ -1197,7 +1193,8 @@ function wp_validate_redirect($location, $default = '') {
 	// In php 5 parse_url may fail if the URL query part contains http://, bug #38143
 	$test = ( $cut = strpos($location, '?') ) ? substr( $location, 0, $cut ) : $location;

-	$lp  = parse_url($test);
+	// @-operator is used to prevent possible warnings in PHP < 5.3.3.
+	$lp = @parse_url($test);

 	// Give up if malformed URL
 	if ( false === $lp )
@@ -1207,9 +1204,17 @@ function wp_validate_redirect($location, $default = '') {
 	if ( isset($lp['scheme']) && !('http' == $lp['scheme'] || 'https' == $lp['scheme']) )
 		return $default;

-	// Reject if scheme is set but host is not. This catches urls like https:host.com for which parse_url does not set the host field.
-	if ( isset($lp['scheme'])  && !isset($lp['host']) )
+	// Reject if certain components are set but host is not. This catches urls like https:host.com for which parse_url does not set the host field.
+	if ( ! isset( $lp['host'] ) && ( isset( $lp['scheme'] ) || isset( $lp['user'] ) || isset( $lp['pass'] ) || isset( $lp['port'] ) ) ) {
 		return $default;
+	}
+
+	// Reject malformed components parse_url() can return on odd inputs.
+	foreach ( array( 'user', 'pass', 'host' ) as $component ) {
+		if ( isset( $lp[ $component ] ) && strpbrk( $lp[ $component ], ':/?#@' ) ) {
+			return $default;
+		}
+	}

 	$wpp = parse_url(home_url());

@@ -1658,11 +1663,17 @@ function wp_verify_nonce($nonce, $action = -1) {
 	$i = wp_nonce_tick();

 	// Nonce generated 0-12 hours ago
-	if ( substr(wp_hash($i . $action . $uid, 'nonce'), -12, 10) === $nonce )
+	$expected = substr( wp_hash( $i . '|' . $action . '|' . $uid, 'nonce'), -12, 10 );
+	if ( hash_equals( $expected, $nonce ) ) {
 		return 1;
+	}
+
 	// Nonce generated 12-24 hours ago
-	if ( substr(wp_hash(($i - 1) . $action . $uid, 'nonce'), -12, 10) === $nonce )
+	$expected = substr( wp_hash( ( $i - 1 ) . '|' . $action . '|' . $uid, 'nonce' ), -12, 10 );
+	if ( hash_equals( $expected, $nonce ) ) {
 		return 2;
+	}
+
 	// Invalid nonce
 	return false;
 }
@@ -1687,7 +1698,7 @@ function wp_create_nonce($action = -1) {

 	$i = wp_nonce_tick();

-	return substr(wp_hash($i . $action . $uid, 'nonce'), -12, 10);
+	return substr(wp_hash($i . '|' . $action . '|' . $uid, 'nonce'), -12, 10);
 }
 endif;

@@ -1863,7 +1874,7 @@ function wp_check_password($password, $hash, $user_id = '') {

 	// If the hash is still md5...
 	if ( strlen($hash) <= 32 ) {
-		$check = ( $hash == md5($password) );
+		$check = hash_equals( $hash, md5( $password ) );
 		if ( $check && $user_id ) {
 			// Rehash using new hash.
 			wp_set_password($password, $user_id);
@@ -2107,7 +2118,8 @@ function get_avatar( $id_or_email, $size = '96', $default = '', $alt = false ) {
 		$out = str_replace( '&#038;', '&amp;', esc_url( $out ) );
 		$avatar = "<img alt='{$safe_alt}' src='{$out}' class='avatar avatar-{$size} photo' height='{$size}' width='{$size}' />";
 	} else {
-		$avatar = "<img alt='{$safe_alt}' src='{$default}' class='avatar avatar-{$size} photo avatar-default' height='{$size}' width='{$size}' />";
+		$out = esc_url( $default );
+		$avatar = "<img alt='{$safe_alt}' src='{$out}' class='avatar avatar-{$size} photo avatar-default' height='{$size}' width='{$size}' />";
 	}

 	/**
@@ -2200,3 +2212,35 @@ function wp_text_diff( $left_string, $right_string, $args = null ) {
 }
 endif;

+if ( ! function_exists( 'hash_equals' ) ) :
+/**
+ * Compare two strings in constant time.
+ *
+ * This function is NOT pluggable. It is in this file (in addition to
+ * compat.php) to prevent errors if, during an update, pluggable.php
+ * copies over but compat.php does not.
+ *
+ * This function was added in PHP 5.6.
+ * It can leak the length of a string.
+ *
+ * @since 3.9.2
+ *
+ * @param string $a Expected string.
+ * @param string $b Actual string.
+ * @return bool Whether strings are equal.
+ */
+function hash_equals( $a, $b ) {
+	$a_length = strlen( $a );
+	if ( $a_length !== strlen( $b ) ) {
+		return false;
+	}
+	$result = 0;
+
+	// Do not attempt to "optimize" this.
+	for ( $i = 0; $i < $a_length; $i++ ) {
+		$result |= ord( $a[ $i ] ) ^ ord( $b[ $i ] );
+	}
+
+	return $result === 0;
+}
+endif;
--- a/wp-includes/post-template.php
+++ b/wp-includes/post-template.php
@@ -1436,7 +1436,7 @@ function wp_get_attachment_link( $id = 0, $size = 'thumbnail', $permalink = fals
 	 * @param bool        $icon      Whether to include an icon. Default false.
 	 * @param string|bool $text      If string, will be link text. Default false.
 	 */
-	return apply_filters( 'wp_get_attachment_link', "<a href='$url'>$link_text</a>", $id, $size, $permalink, $icon, $text );
+	return apply_filters( 'wp_get_attachment_link', "<a href='" . esc_url( $url ) . "'>$link_text</a>", $id, $size, $permalink, $icon, $text );
 }

 /**
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -2736,10 +2736,11 @@ function wp_untrash_post_comments($post = null) {

 	foreach ( $group_by_status as $status => $comments ) {
 		// Sanity check. This shouldn't happen.
-		if ( 'post-trashed' == $status )
+		if ( 'post-trashed' == $status ) {
 			$status = '0';
-		$comments_in = implode( "', '", $comments );
-		$wpdb->query( "UPDATE $wpdb->comments SET comment_approved = '$status' WHERE comment_ID IN ('" . $comments_in . "')" );
+		}
+		$comments_in = implode( ', ', array_map( 'intval', $comments ) );
+		$wpdb->query( $wpdb->prepare( "UPDATE $wpdb->comments SET comment_approved = %s WHERE comment_ID IN ($comments_in)", $status ) );
 	}

 	clean_comment_cache( array_keys($statuses) );
--- a/wp-includes/query.php
+++ b/wp-includes/query.php
@@ -2719,14 +2719,15 @@ class WP_Query {

 		if ( 'any' == $post_type ) {
 			$in_search_post_types = get_post_types( array('exclude_from_search' => false) );
-			if ( empty( $in_search_post_types ) )
+			if ( empty( $in_search_post_types ) ) {
 				$where .= ' AND 1=0 ';
-			else
-				$where .= " AND $wpdb->posts.post_type IN ('" . join("', '", $in_search_post_types ) . "')";
+			} else {
+				$where .= " AND {$wpdb->posts}.post_type IN ('" . join( "', '", array_map( 'esc_sql', $in_search_post_types ) ) . "')";
+			}
 		} elseif ( !empty( $post_type ) && is_array( $post_type ) ) {
-			$where .= " AND $wpdb->posts.post_type IN ('" . join("', '", $post_type) . "')";
+			$where .= " AND {$wpdb->posts}.post_type IN ('" . join("', '", esc_sql( $post_type ) ) . "')";
 		} elseif ( ! empty( $post_type ) ) {
-			$where .= " AND $wpdb->posts.post_type = '$post_type'";
+			$where .= $wpdb->prepare( " AND {$wpdb->posts}.post_type = %s", $post_type );
 			$post_type_object = get_post_type_object ( $post_type );
 		} elseif ( $this->is_attachment ) {
 			$where .= " AND $wpdb->posts.post_type = 'attachment'";
--- a/wp-includes/shortcodes.php
+++ b/wp-includes/shortcodes.php
@@ -185,9 +185,10 @@ function has_shortcode( $content, $tag ) {
 * @uses get_shortcode_regex() Gets the search pattern for searching shortcodes.
 *
 * @param string $content Content to search for shortcodes
+ * @param bool $ignore_html When true, shortcodes inside HTML elements will be skipped.
 * @return string Content with shortcodes filtered out.
 */
-function do_shortcode($content) {
+function do_shortcode( $content, $ignore_html = false ) {
 	global $shortcode_tags;

 	if ( false === strpos( $content, '[' ) ) {
@@ -197,8 +198,24 @@ function do_shortcode($content) {
 	if (empty($shortcode_tags) || !is_array($shortcode_tags))
 		return $content;

+	$tagnames = array_keys($shortcode_tags);
+	$tagregexp = join( '|', array_map('preg_quote', $tagnames) );
+	$pattern = "/\\[($tagregexp)/s";
+
+	if ( 1 !== preg_match( $pattern, $content ) ) {
+		// Avoids parsing HTML when there are no shortcodes or embeds anyway.
+		return $content;
+	}
+
+	$content = do_shortcodes_in_html_tags( $content, $ignore_html );
+
 	$pattern = get_shortcode_regex();
-	return preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $content );
+	$content = preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $content );
+	
+	// Always restore square braces so we don't break things like <!--[if IE ]>
+	$content = unescape_invalid_shortcodes( $content );
+	
+	return $content;
 }

 /**
@@ -291,6 +308,127 @@ function do_shortcode_tag( $m ) {
 	}
 }

+/**
+ * Search only inside HTML elements for shortcodes and process them.
+ *
+ * Any [ or ] characters remaining inside elements will be HTML encoded
+ * to prevent interference with shortcodes that are outside the elements.
+ * Assumes $content processed by KSES already.  Users with unfiltered_html
+ * capability may get unexpected output if angle braces are nested in tags.
+ *
+ * @since 4.2.3
+ *
+ * @param string $content Content to search for shortcodes
+ * @param bool $ignore_html When true, all square braces inside elements will be encoded.
+ * @return string Content with shortcodes filtered out.
+ */
+function do_shortcodes_in_html_tags( $content, $ignore_html ) {
+	// Normalize entities in unfiltered HTML before adding placeholders.
+	$trans = array( '&#91;' => '&#091;', '&#93;' => '&#093;' );
+	$content = strtr( $content, $trans );
+	$trans = array( '[' => '&#91;', ']' => '&#93;' );
+	
+	$pattern = get_shortcode_regex();
+	$textarr = wp_html_split( $content );
+
+	foreach ( $textarr as &$element ) {
+		if ( '' == $element || '<' !== $element[0] ) {
+			continue;
+		}
+
+		$noopen = false === strpos( $element, '[' );
+		$noclose = false === strpos( $element, ']' );
+		if ( $noopen || $noclose ) {
+			// This element does not contain shortcodes.
+			if ( $noopen xor $noclose ) {
+				// Need to encode stray [ or ] chars.
+				$element = strtr( $element, $trans );
+			}
+			continue;
+		}
+
+		if ( $ignore_html || '<!--' === substr( $element, 0, 4 ) || '<![CDATA[' === substr( $element, 0, 9 ) ) {
+			// Encode all [ and ] chars.
+			$element = strtr( $element, $trans );
+			continue;
+		}
+
+		$attributes = wp_kses_attr_parse( $element );
+		if ( false === $attributes ) {
+			// Some plugins are doing things like [name] <[email]>.
+			if ( 1 === preg_match( '%^<\s*\[\[?[^\[\]]+\]%', $element ) ) {
+				$element = preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $element );
+			}
+
+			// Looks like we found some crazy unfiltered HTML.  Skipping it for sanity.
+			$element = strtr( $element, $trans );
+			continue;
+		}
+		
+		// Get element name
+		$front = array_shift( $attributes );
+		$back = array_pop( $attributes );
+		$matches = array();
+		preg_match('%[a-zA-Z0-9]+%', $front, $matches);
+		$elname = $matches[0];
+		
+		// Look for shortcodes in each attribute separately.
+		foreach ( $attributes as &$attr ) {
+			$open = strpos( $attr, '[' );
+			$close = strpos( $attr, ']' );
+			if ( false === $open || false === $close ) {
+				continue; // Go to next attribute.  Square braces will be escaped at end of loop.
+			}
+			$double = strpos( $attr, '"' );
+			$single = strpos( $attr, "'" );
+			if ( ( false === $single || $open < $single ) && ( false === $double || $open < $double ) ) {
+				// $attr like '[shortcode]' or 'name = [shortcode]' implies unfiltered_html.
+				// In this specific situation we assume KSES did not run because the input
+				// was written by an administrator, so we should avoid changing the output
+				// and we do not need to run KSES here.
+				$attr = preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $attr );
+			} else {
+				// $attr like 'name = "[shortcode]"' or "name = '[shortcode]'"
+				// We do not know if $content was unfiltered. Assume KSES ran before shortcodes.
+				$count = 0;
+				$new_attr = preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $attr, -1, $count );
+				if ( $count > 0 ) {
+					// Sanitize the shortcode output using KSES.
+					$new_attr = wp_kses_one_attr( $new_attr, $elname );
+					if ( '' !== $new_attr ) {
+						// The shortcode is safe to use now.
+						$attr = $new_attr;
+					}
+				}
+			}
+		}
+		$element = $front . implode( '', $attributes ) . $back;
+		
+		// Now encode any remaining [ or ] chars.
+		$element = strtr( $element, $trans );
+	}
+	
+	$content = implode( '', $textarr );
+	
+	return $content;
+}
+
+/**
+ * Remove placeholders added by do_shortcodes_in_html_tags().
+ *
+ * @since 4.2.3
+ *
+ * @param string $content Content to search for placeholders.
+ * @return string Content with placeholders removed.
+ */
+function unescape_invalid_shortcodes( $content ) {
+        // Clean up entire string, avoids re-parsing HTML.
+        $trans = array( '&#91;' => '[', '&#93;' => ']' );
+        $content = strtr( $content, $trans );
+        
+        return $content;
+}
+
 /**
 * Retrieve all attributes from the shortcodes tag.
 *
@@ -320,6 +458,15 @@ function shortcode_parse_atts($text) {
 			elseif (isset($m[8]))
 				$atts[] = stripcslashes($m[8]);
 		}
+
+		// Reject any unclosed HTML elements
+		foreach( $atts as &$value ) {
+			if ( false !== strpos( $value, '<' ) ) {
+				if ( 1 !== preg_match( '/^[^<]*+(?:<[^>]*+>[^<]*+)*+$/', $value ) ) {
+					$value = '';
+				}
+			}
+		}
 	} else {
 		$atts = ltrim($text);
 	}
@@ -390,9 +537,15 @@ function strip_shortcodes( $content ) {
 	if (empty($shortcode_tags) || !is_array($shortcode_tags))
 		return $content;

-	$pattern = get_shortcode_regex();
+	$content = do_shortcodes_in_html_tags( $content, true );

-	return preg_replace_callback( "/$pattern/s", 'strip_shortcode_tag', $content );
+	$pattern = get_shortcode_regex();
+	$content = preg_replace_callback( "/$pattern/s", 'strip_shortcode_tag', $content );
+
+	// Always restore square braces so we don't break things like <!--[if IE ]>
+	$content = unescape_invalid_shortcodes( $content );
+	
+	return $content;
 }

 function strip_shortcode_tag( $m ) {
--- a/wp-includes/taxonomy.php
+++ b/wp-includes/taxonomy.php
@@ -595,7 +595,7 @@ function get_objects_in_term( $term_ids, $taxonomies, $args = array() ) {

 	$term_ids = array_map('intval', $term_ids );

-	$taxonomies = "'" . implode( "', '", $taxonomies ) . "'";
+	$taxonomies = "'" . implode( "', '", array_map( 'esc_sql', $taxonomies ) ) . "'";
 	$term_ids = "'" . implode( "', '", $term_ids ) . "'";

 	$object_ids = $wpdb->get_col("SELECT tr.object_id FROM $wpdb->term_relationships AS tr INNER JOIN $wpdb->term_taxonomy AS tt ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ($taxonomies) AND tt.term_id IN ($term_ids) ORDER BY tr.object_id $order");
@@ -1396,7 +1396,7 @@ function get_terms($taxonomies, $args = '') {
 	if ( '' !== $order && !in_array( $order, array( 'ASC', 'DESC' ) ) )
 		$order = 'ASC';

-	$where = "tt.taxonomy IN ('" . implode("', '", $taxonomies) . "')";
+	$where = "tt.taxonomy IN ('" . implode("', '", array_map( 'esc_sql', $taxonomies ) ) . "')";
 	$inclusions = '';
 	if ( ! empty( $include ) ) {
 		$exclude = '';
@@ -2254,7 +2254,7 @@ function wp_get_object_terms($object_ids, $taxonomies, $args = array()) {
 	if ( '' !== $order && ! in_array( $order, array( 'ASC', 'DESC' ) ) )
 		$order = 'ASC';

-	$taxonomies = "'" . implode("', '", $taxonomies) . "'";
+	$taxonomies = "'" . implode("', '", array_map( 'esc_sql', $taxonomies ) ) . "'";
 	$object_ids = implode(', ', $object_ids);

 	$select_this = '';
@@ -3931,4 +3931,4 @@ function wp_check_term_hierarchy_for_loops( $parent, $term_id, $taxonomy ) {
 		wp_update_term( $loop_member, $taxonomy, array( 'parent' => 0 ) );

 	return $parent;
-}
+}
--- a/wp-includes/theme.php
+++ b/wp-includes/theme.php
@@ -665,8 +665,6 @@ function preview_theme() {

 	// Prevent theme mods to current theme being used on theme being previewed
 	add_filter( 'pre_option_theme_mods_' . get_option( 'stylesheet' ), '__return_empty_array' );
-
-	ob_start( 'preview_theme_ob_filter' );
 }
 add_action('setup_theme', 'preview_theme');

@@ -704,7 +702,7 @@ function _preview_theme_stylesheet_filter() {
 * @return string
 */
 function preview_theme_ob_filter( $content ) {
-	return preg_replace_callback( "|(<a.*?href=([\"']))(.*?)([\"'].*?>)|", 'preview_theme_ob_filter_callback', $content );
+	return $content;
 }

 /**
@@ -719,26 +717,7 @@ function preview_theme_ob_filter( $content ) {
 * @return string
 */
 function preview_theme_ob_filter_callback( $matches ) {
-	if ( strpos($matches[4], 'onclick') !== false )
-		$matches[4] = preg_replace('#onclick=([\'"]).*?(?<!\\\)\\1#i', '', $matches[4]); //Strip out any onclicks from rest of <a>. (?<!\\\) means to ignore the '" if it's escaped by \  to prevent breaking mid-attribute.
-	if (
-		( false !== strpos($matches[3], '/wp-admin/') )
-	||
-		( false !== strpos( $matches[3], '://' ) && 0 !== strpos( $matches[3], home_url() ) )
-	||
-		( false !== strpos($matches[3], '/feed/') )
-	||
-		( false !== strpos($matches[3], '/trackback/') )
-	)
-		return $matches[1] . "#$matches[2] onclick=$matches[2]return false;" . $matches[4];
-
-	$stylesheet = isset( $_GET['stylesheet'] ) ? $_GET['stylesheet'] : '';
-	$template   = isset( $_GET['template'] )   ? $_GET['template']   : '';
-
-	$link = add_query_arg( array( 'preview' => 1, 'template' => $template, 'stylesheet' => $stylesheet, 'preview_iframe' => 1 ), $matches[3] );
-	if ( 0 === strpos($link, 'preview=1') )
-		$link = "?$link";
-	return $matches[1] . esc_attr( $link ) . $matches[4];
+	return $matches[0];
 }

 /**
--- a/wp-includes/update.php
+++ b/wp-includes/update.php
@@ -611,19 +611,8 @@ function wp_schedule_update_checks() {
 	if ( !wp_next_scheduled('wp_update_themes') && !defined('WP_INSTALLING') )
 		wp_schedule_event(time(), 'twicedaily', 'wp_update_themes');

-	if ( ! wp_next_scheduled( 'wp_maybe_auto_update' ) && ! defined( 'WP_INSTALLING' ) ) {
-		// Schedule auto updates for 7 a.m. and 7 p.m. in the timezone of the site.
-		$next = strtotime( 'today 7am' );
-		$now = time();
-		// Find the next instance of 7 a.m. or 7 p.m., but skip it if it is within 3 hours from now.
-		while ( ( $now + 3 * HOUR_IN_SECONDS ) > $next ) {
-			$next += 12 * HOUR_IN_SECONDS;
-		}
-		$next = $next - get_option( 'gmt_offset' ) * HOUR_IN_SECONDS;
-		// Add a random number of minutes, so we don't have all sites trying to update exactly on the hour
-		$next = $next + rand( 0, 59 ) * MINUTE_IN_SECONDS;
-		wp_schedule_event( $next, 'twicedaily', 'wp_maybe_auto_update' );
-	}
+	if ( ( wp_next_scheduled( 'wp_maybe_auto_update' ) > ( time() + HOUR_IN_SECONDS ) ) && ! defined('WP_INSTALLING') )
+		wp_clear_scheduled_hook( 'wp_maybe_auto_update' );
 }

 if ( ( ! is_main_site() && ! is_network_admin() ) || ( defined( 'DOING_AJAX' ) && DOING_AJAX ) )
--- a/wp-includes/user.php
+++ b/wp-includes/user.php
@@ -1716,6 +1716,9 @@ function wp_insert_user( $userdata ) {
 	$data = wp_unslash( $data );

 	if ( $update ) {
+		if ( $user_email !== $old_user_data->user_email ) {
+			$data['user_activation_key'] = '';
+		}
 		$wpdb->update( $wpdb->users, $data, compact( 'ID' ) );
 		$user_id = (int) $ID;
 	} else {
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,21 +4,21 @@
 *
 * @global string $wp_version
 */
-$wp_version = '3.9.1';
+$wp_version = '3.9.17';

 /**
 * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
 *
 * @global int $wp_db_version
 */
-$wp_db_version = 27916;
+$wp_db_version = 27918;

 /**
 * Holds the TinyMCE version
 *
 * @global string $tinymce_version
 */
-$tinymce_version = '4021-20140423';
+$tinymce_version = '4021-20150505';

 /**
 * Holds the required PHP version
--- a/wp-includes/wp-db.php
+++ b/wp-includes/wp-db.php
--- a/wp-login.php
+++ b/wp-login.php
@@ -523,7 +523,7 @@ case 'retrievepassword' :

 ?>

-<form name="lostpasswordform" id="lostpasswordform" action="<?php echo esc_url( site_url( 'wp-login.php?action=lostpassword', 'login_post' ) ); ?>" method="post">
+<form name="lostpasswordform" id="lostpasswordform" action="<?php echo esc_url( network_site_url( 'wp-login.php?action=lostpassword', 'login_post' ) ); ?>" method="post">
 	<p>
 		<label for="user_login" ><?php _e('Username or E-mail:') ?><br />
 		<input type="text" name="user_login" id="user_login" class="input" value="<?php echo esc_attr($user_login); ?>" size="20" /></label>
@@ -562,10 +562,28 @@ break;

 case 'resetpass' :
 case 'rp' :
-	$user = check_password_reset_key($_GET['key'], $_GET['login']);
+	list( $rp_path ) = explode( '?', wp_unslash( $_SERVER['REQUEST_URI'] ) );
+	$rp_cookie = 'wp-resetpass-' . COOKIEHASH;
+	if ( isset( $_GET['key'] ) ) {
+		$value = sprintf( '%s:%s', wp_unslash( $_GET['login'] ), wp_unslash( $_GET['key'] ) );
+		setcookie( $rp_cookie, $value, 0, $rp_path, COOKIE_DOMAIN, is_ssl(), true );
+		wp_safe_redirect( remove_query_arg( array( 'key', 'login' ) ) );
+		exit;
+	}

-	if ( is_wp_error($user) ) {
-		if ( $user->get_error_code() === 'expired_key' )
+	if ( isset( $_COOKIE[ $rp_cookie ] ) && 0 < strpos( $_COOKIE[ $rp_cookie ], ':' ) ) {
+		list( $rp_login, $rp_key ) = explode( ':', wp_unslash( $_COOKIE[ $rp_cookie ] ), 2 );
+		$user = check_password_reset_key( $rp_key, $rp_login );
+		if ( isset( $_POST['pass1'] ) && ! hash_equals( $rp_key, $_POST['rp_key'] ) ) {
+			$user = false;
+		}
+	} else {
+		$user = false;
+	}
+
+	if ( ! $user || is_wp_error( $user ) ) {
+		setcookie( $rp_cookie, ' ', time() - YEAR_IN_SECONDS, $rp_path, COOKIE_DOMAIN, is_ssl(), true );
+		if ( $user && $user->get_error_code() === 'expired_key' )
 			wp_redirect( site_url( 'wp-login.php?action=lostpassword&error=expiredkey' ) );
 		else
 			wp_redirect( site_url( 'wp-login.php?action=lostpassword&error=invalidkey' ) );
@@ -589,6 +607,7 @@ case 'rp' :

 	if ( ( ! $errors->get_error_code() ) && isset( $_POST['pass1'] ) && !empty( $_POST['pass1'] ) ) {
 		reset_password($user, $_POST['pass1']);
+		setcookie( $rp_cookie, ' ', time() - YEAR_IN_SECONDS, $rp_path, COOKIE_DOMAIN, is_ssl(), true );
 		login_header( __( 'Password Reset' ), '<p class="message reset-pass">' . __( 'Your password has been reset.' ) . ' <a href="' . esc_url( wp_login_url() ) . '">' . __( 'Log in' ) . '</a></p>' );
 		login_footer();
 		exit;
@@ -600,8 +619,8 @@ case 'rp' :
 	login_header(__('Reset Password'), '<p class="message reset-pass">' . __('Enter your new password below.') . '</p>', $errors );

 ?>
-<form name="resetpassform" id="resetpassform" action="<?php echo esc_url( site_url( 'wp-login.php?action=resetpass&key=' . urlencode( $_GET['key'] ) . '&login=' . urlencode( $_GET['login'] ), 'login_post' ) ); ?>" method="post" autocomplete="off">
-	<input type="hidden" id="user_login" value="<?php echo esc_attr( $_GET['login'] ); ?>" autocomplete="off" />
+<form name="resetpassform" id="resetpassform" action="<?php echo esc_url( network_site_url( 'wp-login.php?action=resetpass', 'login_post' ) ); ?>" method="post" autocomplete="off">
+	<input type="hidden" id="user_login" value="<?php echo esc_attr( $rp_login ); ?>" autocomplete="off" />

 	<p>
 		<label for="pass1"><?php _e('New password') ?><br />
@@ -627,6 +646,7 @@ case 'rp' :
 	 */
 	do_action( 'resetpass_form', $user );
 	?>
+	<input type="hidden" name="rp_key" value="<?php echo esc_attr( $rp_key ); ?>" />
 	<p class="submit"><input type="submit" name="wp-submit" id="wp-submit" class="button button-primary button-large" value="<?php esc_attr_e('Reset Password'); ?>" /></p>
 </form>

--- a/wp-mail.php
+++ b/wp-mail.php
@@ -14,6 +14,12 @@ require(dirname(__FILE__) . '/wp-load.php');
 if ( ! apply_filters( 'enable_post_by_email_configuration', true ) )
 	wp_die( __( 'This action has been disabled by the administrator.' ) );

+$mailserver_url = get_option( 'mailserver_url' );
+
+if ( 'mail.example.com' === $mailserver_url || empty( $mailserver_url ) ) {
+	wp_die( __( 'This action has been disabled by the administrator.' ), 403 );
+}
+
 /**
 * Fires to allow a plugin to do a complete takeover of Post by Email.
 *