diff --git a/web/pgadmin/browser/server_groups/servers/databases/event_triggers/__init__.py b/web/pgadmin/browser/server_groups/servers/databases/event_triggers/__init__.py
index 1030b9672..0f7c126c7 100644
--- a/web/pgadmin/browser/server_groups/servers/databases/event_triggers/__init__.py
+++ b/web/pgadmin/browser/server_groups/servers/databases/event_triggers/__init__.py
@@ -673,7 +673,7 @@ class EventTriggerView(PGChildNodeView, SchemaDiffObjectCompare):
                     data[arg] = old_data[arg]
             sql = render_template(
                 "/".join([self.template_path, self._UPDATE_SQL]),
-                data=data, o_data=old_data
+                data=data, o_data=old_data, conn=self.conn
             )
         else:
             sql = self._get_create_with_grant_sql(data)
diff --git a/web/pgadmin/browser/server_groups/servers/databases/event_triggers/templates/event_triggers/sql/default/update.sql b/web/pgadmin/browser/server_groups/servers/databases/event_triggers/templates/event_triggers/sql/default/update.sql
index 066d1decd..970095f87 100644
--- a/web/pgadmin/browser/server_groups/servers/databases/event_triggers/templates/event_triggers/sql/default/update.sql
+++ b/web/pgadmin/browser/server_groups/servers/databases/event_triggers/templates/event_triggers/sql/default/update.sql
@@ -26,7 +26,7 @@ ALTER EVENT TRIGGER {{ conn|qtIdent(o_data.name) }}
 
 {% if data.comment is defined and data.comment != o_data.comment %}
 COMMENT ON EVENT TRIGGER {{ conn|qtIdent(data.name) }}
-    IS '{{ data.comment }}';
+    IS {{ data.comment|qtLiteral(conn) }};
 {% endif %}
 
 {% if data.enabled and data.enabled != o_data.enabled %}
diff --git a/web/pgadmin/browser/server_groups/servers/databases/foreign_data_wrappers/foreign_servers/__init__.py b/web/pgadmin/browser/server_groups/servers/databases/foreign_data_wrappers/foreign_servers/__init__.py
index 015b22a8a..ce888291b 100644
--- a/web/pgadmin/browser/server_groups/servers/databases/foreign_data_wrappers/foreign_servers/__init__.py
+++ b/web/pgadmin/browser/server_groups/servers/databases/foreign_data_wrappers/foreign_servers/__init__.py
@@ -821,7 +821,7 @@ class ForeignServerView(PGChildNodeView, SchemaDiffObjectCompare):
                 is_valid_options = True
 
         sql = render_template("/".join([self.template_path, self._ACL_SQL]),
-                              fsid=fsid)
+                              fsid=fsid, conn=self.conn)
         status, fs_rv_acl_res = self.conn.execute_dict(sql)
         if not status:
             return internal_server_error(errormsg=fs_rv_acl_res)
diff --git a/web/pgadmin/browser/server_groups/servers/databases/languages/templates/languages/sql/default/update.sql b/web/pgadmin/browser/server_groups/servers/databases/languages/templates/languages/sql/default/update.sql
index f8b3f2579..73ec91e9c 100644
--- a/web/pgadmin/browser/server_groups/servers/databases/languages/templates/languages/sql/default/update.sql
+++ b/web/pgadmin/browser/server_groups/servers/databases/languages/templates/languages/sql/default/update.sql
@@ -39,7 +39,7 @@ ALTER LANGUAGE {{ conn|qtIdent(data.name) }}
 {# ============= Update language comments ============= #}
 {% if data.description is defined and data.description != o_data.description %}
 COMMENT ON LANGUAGE {{ conn|qtIdent(data.name) }}
-    IS '{{ data.description }}';
+    IS {{ data.description|qtLiteral(conn) }};
 {% endif %}
 {% endif %}
 
diff --git a/web/pgadmin/browser/server_groups/servers/databases/schemas/__init__.py b/web/pgadmin/browser/server_groups/servers/databases/schemas/__init__.py
index 697183d17..6a0235a93 100644
--- a/web/pgadmin/browser/server_groups/servers/databases/schemas/__init__.py
+++ b/web/pgadmin/browser/server_groups/servers/databases/schemas/__init__.py
@@ -800,7 +800,8 @@ It may have been removed by another user.
                 SQL = render_template(
                     "/".join([self.template_path, 'sql/get_name.sql']),
                     _=gettext,
-                    scid=scid
+                    scid=scid,
+                    conn=self.conn
                 )
 
                 status, name = self.conn.execute_scalar(SQL)
diff --git a/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/__init__.py b/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/__init__.py
index 56b6d1fab..270df949e 100644
--- a/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/__init__.py
+++ b/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/__init__.py
@@ -776,7 +776,8 @@ AND relkind != 'c'))"""
             data.update(parse_sec_labels_from_db(data['seclabels']))
 
         SQL = render_template("/".join([self.template_path,
-                                        self._CREATE_SQL]), data=data)
+                                        self._CREATE_SQL]),
+                              data=data, conn=self.conn)
 
         sql_header = """-- DOMAIN: {0}.{1}\n\n""".format(
             data['basensp'], data['name'])
@@ -838,7 +839,7 @@ AND relkind != 'c'))"""
         if 'fulltype' in data or 'basetype' in data or 'collname' in data:
             SQL = render_template(
                 "/".join([self.template_path, 'domain_schema_diff.sql']),
-                data=data, o_data=old_data)
+                data=data, o_data=old_data, conn=self.conn)
         else:
             if is_schema_diff:
                 data['is_schema_diff'] = True
@@ -894,7 +895,7 @@ AND relkind != 'c'))"""
         else:
             SQL = render_template("/".join([self.template_path,
                                             self._CREATE_SQL]),
-                                  data=data)
+                                  data=data, conn=self.conn)
             return SQL.strip('\n'), data['name']
 
     @check_precondition
diff --git a/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/domain_constraints/__init__.py b/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/domain_constraints/__init__.py
index 2c6f5b61e..200ccff33 100644
--- a/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/domain_constraints/__init__.py
+++ b/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/domain_constraints/__init__.py
@@ -620,7 +620,8 @@ class DomainConstraintView(PGChildNodeView):
 
         SQL = render_template("/".join([self.template_path,
                                         self._CREATE_SQL]),
-                              data=data, domain=domain, schema=schema)
+                              data=data, domain=domain, schema=schema,
+                              conn=self.conn)
 
         sql_header = """-- CHECK: {1}.{0}
 
@@ -696,7 +697,8 @@ class DomainConstraintView(PGChildNodeView):
 
                 SQL = render_template("/".join([self.template_path,
                                                 self._CREATE_SQL]),
-                                      data=data, domain=domain, schema=schema)
+                                      data=data, domain=domain, schema=schema,
+                                      conn=self.conn)
             if 'name' in data:
                 return True, SQL.strip('\n'), data['name']
             else:
diff --git a/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/domain_constraints/templates/domain_constraints/sql/default/create.sql b/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/domain_constraints/templates/domain_constraints/sql/default/create.sql
index ad993f7ab..3412e8664 100644
--- a/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/domain_constraints/templates/domain_constraints/sql/default/create.sql
+++ b/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/domain_constraints/templates/domain_constraints/sql/default/create.sql
@@ -6,5 +6,5 @@ ALTER DOMAIN {{ conn|qtIdent(schema, domain) }}
 
 
 COMMENT ON CONSTRAINT {{ conn|qtIdent(data.name) }} ON DOMAIN {{ conn|qtIdent(schema, domain) }}
-    IS '{{ data.description }}';{% endif %}
+    IS {{ data.description|qtLiteral(conn) }};{% endif %}
 {% endif %}
diff --git a/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/templates/domains/sql/default/create.sql b/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/templates/domains/sql/default/create.sql
index c8cc08313..a9fe0443a 100644
--- a/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/templates/domains/sql/default/create.sql
+++ b/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/templates/domains/sql/default/create.sql
@@ -20,14 +20,14 @@ ALTER DOMAIN {{ conn|qtIdent(data.basensp, data.name) }}
 {% if c.description %}
 
 COMMENT ON CONSTRAINT {{ conn|qtIdent(c.conname) }} ON DOMAIN {{ conn|qtIdent(data.basensp, data.name) }}
-    IS '{{ c.description }}';
+    IS {{ c.description|qtLiteral(conn) }};
 {% endif %}
 {% endfor -%}
 {% endif %}
 
 {% if data.description %}
 COMMENT ON DOMAIN {{ conn|qtIdent(data.basensp, data.name) }}
-    IS '{{ data.description }}';{% endif -%}
+    IS {{ data.description|qtLiteral(conn) }};{% endif -%}
 
 {% if data.seclabels %}
 {% for r in data.seclabels %}
diff --git a/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/templates/domains/sql/default/domain_schema_diff.sql b/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/templates/domains/sql/default/domain_schema_diff.sql
index 3c5e152a7..157dbc156 100644
--- a/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/templates/domains/sql/default/domain_schema_diff.sql
+++ b/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/templates/domains/sql/default/domain_schema_diff.sql
@@ -25,7 +25,7 @@ ALTER DOMAIN {{ conn|qtIdent(o_data.basensp, o_data.name) }}
 {% if c.description %}
 
 COMMENT ON CONSTRAINT {{ conn|qtIdent(c.conname) }} ON DOMAIN {{ conn|qtIdent(o_data.basensp, o_data.name) }}
-    IS '{{ c.description }}';
+    IS {{ c.description|qtLiteral(conn) }};
 {% endif %}
 {% endfor -%}
 {% for c in data.constraints.changed %}{% if c.conname and c.consrc %}
@@ -35,14 +35,14 @@ ALTER DOMAIN {{ conn|qtIdent(o_data.basensp, o_data.name) }}
 {% if c.description %}
 
 COMMENT ON CONSTRAINT {{ conn|qtIdent(c.conname) }} ON DOMAIN {{ conn|qtIdent(o_data.basensp, o_data.name) }}
-    IS '{{ c.description }}';
+    IS {{ c.description|qtLiteral(conn) }};
 {% endif %}
 {% endfor -%}
 {% endif %}
 
 {% if data.description %}
 COMMENT ON DOMAIN {{ conn|qtIdent(o_data.basensp, o_data.name) }}
-    IS '{{ data.description }}';{% endif -%}
+    IS {{ data.description|qtLiteral(conn) }};{% endif -%}
 
 {% if data.seclabels %}
 {% for r in data.seclabels %}
diff --git a/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/templates/domains/sql/default/update.sql b/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/templates/domains/sql/default/update.sql
index 4241b505a..315b9f922 100644
--- a/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/templates/domains/sql/default/update.sql
+++ b/web/pgadmin/browser/server_groups/servers/databases/schemas/domains/templates/domains/sql/default/update.sql
@@ -69,7 +69,7 @@ ALTER DOMAIN {{ conn|qtIdent(o_data.basensp, name) }}
 {% if c.description %}
 
 COMMENT ON CONSTRAINT {{ conn|qtIdent(c.conname) }} ON DOMAIN {{ conn|qtIdent(o_data.basensp, name) }}
-    IS '{{ c.description }}';
+    IS {{ c.description|qtLiteral(conn) }};
 {% endif %}
 {% endfor -%}{% endif -%}
 {% set seclabels = data.seclabels %}
diff --git a/web/pgadmin/browser/server_groups/servers/databases/schemas/foreign_tables/templates/foreign_tables/sql/default/create.sql b/web/pgadmin/browser/server_groups/servers/databases/schemas/foreign_tables/templates/foreign_tables/sql/default/create.sql
index 05c464817..f9a45df87 100644
--- a/web/pgadmin/browser/server_groups/servers/databases/schemas/foreign_tables/templates/foreign_tables/sql/default/create.sql
+++ b/web/pgadmin/browser/server_groups/servers/databases/schemas/foreign_tables/templates/foreign_tables/sql/default/create.sql
@@ -48,7 +48,7 @@ ALTER FOREIGN TABLE {{ conn|qtIdent(data.basensp, data.name) }}
 {% if data.description %}
 
 COMMENT ON FOREIGN TABLE {{ conn|qtIdent(data.basensp, data.name) }}
-    IS '{{ data.description }}';
+    IS {{ data.description|qtLiteral(conn) }};
 {% endif -%}
 {% if data.columns and data.columns|length > 0 %}
 {% for c in data.columns %}
diff --git a/web/pgadmin/browser/server_groups/servers/databases/schemas/foreign_tables/templates/foreign_tables/sql/default/foreign_table_schema_diff.sql b/web/pgadmin/browser/server_groups/servers/databases/schemas/foreign_tables/templates/foreign_tables/sql/default/foreign_table_schema_diff.sql
index 83acb8fb8..2645df37e 100644
--- a/web/pgadmin/browser/server_groups/servers/databases/schemas/foreign_tables/templates/foreign_tables/sql/default/foreign_table_schema_diff.sql
+++ b/web/pgadmin/browser/server_groups/servers/databases/schemas/foreign_tables/templates/foreign_tables/sql/default/foreign_table_schema_diff.sql
@@ -54,11 +54,11 @@ ALTER FOREIGN TABLE {{ conn|qtIdent(o_data.basensp, o_data.name) }}
 {% if data.description %}
 
 COMMENT ON FOREIGN TABLE {{ conn|qtIdent(o_data.basensp, o_data.name) }}
-    IS '{{ data.description }}';
-{ % elif o_data.description %}
+    IS {{ data.description|qtLiteral(conn) }};
+{% elif o_data.description %}
 
 COMMENT ON FOREIGN TABLE {{ conn|qtIdent(o_data.basensp, o_data.name) }}
-    IS '{{ o_data.description }}';
+    IS {{ o_data.description|qtLiteral(conn) }};
 {% endif -%}
 {% if acl %}
 
diff --git a/web/pgadmin/browser/server_groups/servers/databases/schemas/functions/__init__.py b/web/pgadmin/browser/server_groups/servers/databases/schemas/functions/__init__.py
index d1f76e243..c73de2d07 100644
--- a/web/pgadmin/browser/server_groups/servers/databases/schemas/functions/__init__.py
+++ b/web/pgadmin/browser/server_groups/servers/databases/schemas/functions/__init__.py
@@ -1615,7 +1615,7 @@ class FunctionView(PGChildNodeView, DataTypeReader, SchemaDiffObjectCompare):
                 render_template(
                     'schemas/pg/#{0}#/sql/get_name.sql'.format(
                         self.manager.version),
-                    scid=scid
+                    scid=scid, conn=self.conn
                 )
             )
             if not status:
diff --git a/web/pgadmin/browser/server_groups/servers/databases/schemas/tables/utils.py b/web/pgadmin/browser/server_groups/servers/databases/schemas/tables/utils.py
index 0c9d3f5a4..30393dd18 100644
--- a/web/pgadmin/browser/server_groups/servers/databases/schemas/tables/utils.py
+++ b/web/pgadmin/browser/server_groups/servers/databases/schemas/tables/utils.py
@@ -888,7 +888,7 @@ class BaseTableView(PGChildNodeView, BasePartitionTable, VacuumSettings):
             rules_sql += render_template("/".join(
                 [self.rules_template_path, self._CREATE_SQL]),
                 data=res_data, display_comments=display_comments,
-                add_replace_clause=True
+                add_replace_clause=True, conn=self.conn
             )
 
             # Add into main sql
diff --git a/web/pgadmin/browser/server_groups/servers/databases/schemas/views/templates/views/pg/default/sql/view_id.sql b/web/pgadmin/browser/server_groups/servers/databases/schemas/views/templates/views/pg/default/sql/view_id.sql
index a4565a31a..f0b2b8741 100644
--- a/web/pgadmin/browser/server_groups/servers/databases/schemas/views/templates/views/pg/default/sql/view_id.sql
+++ b/web/pgadmin/browser/server_groups/servers/databases/schemas/views/templates/views/pg/default/sql/view_id.sql
@@ -2,5 +2,5 @@
 {% if data %}
 SELECT c.oid, c.relname FROM pg_catalog.pg_class c
 LEFT OUTER JOIN pg_catalog.pg_namespace nsp on nsp.oid = c.relnamespace
-WHERE c.relname = {{ data.name |qtLiteral(conn) }} and nsp.nspname = '{{ data.schema }}';
+WHERE c.relname = {{ data.name |qtLiteral(conn) }} and nsp.nspname = {{ data.schema|qtLiteral(conn) }};
 {% endif %}
diff --git a/web/pgadmin/browser/server_groups/servers/databases/schemas/views/templates/views/ppas/default/sql/view_id.sql b/web/pgadmin/browser/server_groups/servers/databases/schemas/views/templates/views/ppas/default/sql/view_id.sql
index c38976ff7..f2a38fda5 100644
--- a/web/pgadmin/browser/server_groups/servers/databases/schemas/views/templates/views/ppas/default/sql/view_id.sql
+++ b/web/pgadmin/browser/server_groups/servers/databases/schemas/views/templates/views/ppas/default/sql/view_id.sql
@@ -2,5 +2,5 @@
 {% if data %}
 SELECT c.oid, c.relname FROM pg_catalog.pg_class c
 LEFT OUTER JOIN pg_catalog.pg_namespace nsp on nsp.oid = c.relnamespace
-WHERE c.relname = {{ data.name|qtLiteral(conn) }} and nsp.nspname = '{{ data.schema}}';
+WHERE c.relname = {{ data.name|qtLiteral(conn) }} and nsp.nspname = {{ data.schema|qtLiteral(conn) }};
 {% endif %}
diff --git a/web/pgadmin/browser/server_groups/servers/databases/tests/test_comment_description_sql_escaping.py b/web/pgadmin/browser/server_groups/servers/databases/tests/test_comment_description_sql_escaping.py
new file mode 100644
index 000000000..25658d1eb
--- /dev/null
+++ b/web/pgadmin/browser/server_groups/servers/databases/tests/test_comment_description_sql_escaping.py
@@ -0,0 +1,358 @@
+##########################################################################
+#
+# pgAdmin 4 - PostgreSQL Tools
+#
+# Copyright (C) 2013 - 2026, The pgAdmin Development Team
+# This software is released under the PostgreSQL Licence
+#
+##########################################################################
+
+"""Regression test: COMMENT ... IS '<description>' templates must escape the
+description through the qtLiteral filter so that user-supplied apostrophes
+cannot break out of the string literal.
+
+This covers all template sites that previously interpolated descriptions as
+``'{{ value }}'`` and were vulnerable to SQL injection via the description
+input on the corresponding pgAdmin dialogs.
+"""
+
+import os
+
+from flask import Flask, render_template
+from jinja2 import FileSystemLoader
+
+from pgadmin.utils.driver import get_driver
+from pgadmin.utils.route import BaseTestGenerator
+from config import PG_DEFAULT_DRIVER
+
+
+# A description containing an apostrophe and a trailing SQL statement. If the
+# template fails to escape, the rendered SQL closes the literal early and the
+# remaining text becomes executable SQL.
+PAYLOAD = "x'; DROP TABLE pg_class; --"
+
+# After correct qtLiteral escaping the apostrophe is doubled and the value is
+# wrapped in single quotes.
+SAFE_FRAGMENT = "'x''; DROP TABLE pg_class; --'"
+
+# What the vulnerable template used to render: the apostrophe is not doubled,
+# so the literal closes after ``x`` and the remainder becomes executable SQL.
+VULN_FRAGMENT = "'x'; DROP TABLE pg_class; --'"
+
+
+WEB_ROOT = os.path.realpath(
+    os.path.join(os.path.dirname(os.path.realpath(__file__)),
+                 os.pardir, os.pardir, os.pardir, os.pardir, os.pardir,
+                 os.pardir)
+)
+
+
+class _FakeConn:
+    """psycopg.sql.Literal.as_string() accepts None as its context and still
+    produces the canonical PostgreSQL-escaped literal. The production
+    ``qtLiteral`` short-circuits when its conn argument is falsy, so we hand
+    it an object whose ``.conn`` is None: that exercises the real escape
+    branch (``psycopg.sql.Literal(value).as_string(None)``) without needing a
+    live PostgreSQL connection."""
+
+    conn = None
+
+    def __bool__(self):
+        return True
+
+
+def _abs(*parts):
+    return os.path.join(WEB_ROOT, *parts)
+
+
+# Jinja loader roots needed by the affected templates. Each template imports
+# macros via paths like ``macros/schemas/security.macros`` or
+# ``macros/privilege.macros`` which resolve against these roots.
+MACRO_ROOTS = [
+    _abs('pgadmin', 'browser', 'server_groups', 'servers',
+         'databases', 'schemas', 'templates'),
+    _abs('pgadmin', 'browser', 'server_groups', 'servers', 'templates'),
+]
+
+
+class CommentDescriptionSQLEscapingTestCase(BaseTestGenerator):
+    """Verify each previously-vulnerable COMMENT template escapes the
+    description through ``qtLiteral`` so apostrophes cannot terminate the
+    SQL string literal early."""
+
+    scenarios = [
+        (
+            'Domain create - data.description (domain comment)',
+            dict(
+                template_root=_abs(
+                    'pgadmin', 'browser', 'server_groups', 'servers',
+                    'databases', 'schemas', 'domains', 'templates'),
+                template='domains/sql/default/create.sql',
+                ctx=dict(
+                    data=dict(name='d1', basensp='public', basetype='text',
+                              description=PAYLOAD),
+                    conn=_FakeConn(),
+                ),
+            ),
+        ),
+        (
+            'Domain create - c.description (constraint comment)',
+            dict(
+                template_root=_abs(
+                    'pgadmin', 'browser', 'server_groups', 'servers',
+                    'databases', 'schemas', 'domains', 'templates'),
+                template='domains/sql/default/create.sql',
+                ctx=dict(
+                    data=dict(
+                        name='d1', basensp='public', basetype='text',
+                        constraints=[
+                            dict(conname='c1', consrc='VALUE > 0',
+                                 description=PAYLOAD),
+                        ],
+                    ),
+                    conn=_FakeConn(),
+                ),
+            ),
+        ),
+        (
+            'Domain update - c.description in constraints.added',
+            dict(
+                template_root=_abs(
+                    'pgadmin', 'browser', 'server_groups', 'servers',
+                    'databases', 'schemas', 'domains', 'templates'),
+                template='domains/sql/default/update.sql',
+                ctx=dict(
+                    data=dict(
+                        name='d1',
+                        constraints=dict(
+                            deleted=[], changed=[],
+                            added=[dict(conname='c1', consrc='VALUE > 0',
+                                        description=PAYLOAD)],
+                        ),
+                        seclabels=dict(),
+                    ),
+                    o_data=dict(name='d1', basensp='public', constraints={}),
+                    conn=_FakeConn(),
+                ),
+            ),
+        ),
+        (
+            'Domain schema diff - data.description (domain comment)',
+            dict(
+                template_root=_abs(
+                    'pgadmin', 'browser', 'server_groups', 'servers',
+                    'databases', 'schemas', 'domains', 'templates'),
+                template='domains/sql/default/domain_schema_diff.sql',
+                ctx=dict(
+                    data=dict(description=PAYLOAD),
+                    o_data=dict(name='d1', basensp='public', fulltype='text'),
+                    conn=_FakeConn(),
+                ),
+            ),
+        ),
+        (
+            'Domain schema diff - c.description in constraints.added',
+            dict(
+                template_root=_abs(
+                    'pgadmin', 'browser', 'server_groups', 'servers',
+                    'databases', 'schemas', 'domains', 'templates'),
+                template='domains/sql/default/domain_schema_diff.sql',
+                ctx=dict(
+                    data=dict(
+                        constraints=dict(
+                            added=[dict(conname='c1', consrc='VALUE > 0',
+                                        description=PAYLOAD)],
+                            changed=[],
+                        ),
+                    ),
+                    o_data=dict(name='d1', basensp='public', fulltype='text'),
+                    conn=_FakeConn(),
+                ),
+            ),
+        ),
+        (
+            'Domain schema diff - c.description in constraints.changed',
+            dict(
+                template_root=_abs(
+                    'pgadmin', 'browser', 'server_groups', 'servers',
+                    'databases', 'schemas', 'domains', 'templates'),
+                template='domains/sql/default/domain_schema_diff.sql',
+                ctx=dict(
+                    data=dict(
+                        constraints=dict(
+                            added=[],
+                            changed=[dict(conname='c1', consrc='VALUE > 0',
+                                          description=PAYLOAD)],
+                        ),
+                    ),
+                    o_data=dict(name='d1', basensp='public', fulltype='text'),
+                    conn=_FakeConn(),
+                ),
+            ),
+        ),
+        (
+            'Domain constraint create - data.description',
+            dict(
+                template_root=_abs(
+                    'pgadmin', 'browser', 'server_groups', 'servers',
+                    'databases', 'schemas', 'domains', 'domain_constraints',
+                    'templates'),
+                template='domain_constraints/sql/default/create.sql',
+                ctx=dict(
+                    data=dict(name='c1', consrc='VALUE > 0',
+                              description=PAYLOAD),
+                    schema='public', domain='d1',
+                    conn=_FakeConn(),
+                ),
+            ),
+        ),
+        (
+            'Foreign table create - data.description',
+            dict(
+                template_root=_abs(
+                    'pgadmin', 'browser', 'server_groups', 'servers',
+                    'databases', 'schemas', 'foreign_tables', 'templates'),
+                template='foreign_tables/sql/default/create.sql',
+                ctx=dict(
+                    data=dict(
+                        name='ft1', basensp='public', ftsrvname='srv',
+                        description=PAYLOAD, columns=[], constraints=[],
+                    ),
+                    is_sql=False,
+                    conn=_FakeConn(),
+                ),
+            ),
+        ),
+        (
+            'Foreign table schema diff - data.description',
+            dict(
+                template_root=_abs(
+                    'pgadmin', 'browser', 'server_groups', 'servers',
+                    'databases', 'schemas', 'foreign_tables', 'templates'),
+                template='foreign_tables/sql/default/'
+                         'foreign_table_schema_diff.sql',
+                ctx=dict(
+                    data=dict(description=PAYLOAD, ftsrvname='srv'),
+                    o_data=dict(name='ft1', basensp='public',
+                                columns=[], constraints=[]),
+                    is_sql=False,
+                    conn=_FakeConn(),
+                ),
+            ),
+        ),
+        (
+            'Foreign table schema diff - o_data.description (elif branch)',
+            dict(
+                template_root=_abs(
+                    'pgadmin', 'browser', 'server_groups', 'servers',
+                    'databases', 'schemas', 'foreign_tables', 'templates'),
+                template='foreign_tables/sql/default/'
+                         'foreign_table_schema_diff.sql',
+                ctx=dict(
+                    data=dict(ftsrvname='srv'),
+                    o_data=dict(name='ft1', basensp='public',
+                                columns=[], constraints=[],
+                                description=PAYLOAD),
+                    is_sql=False,
+                    conn=_FakeConn(),
+                ),
+            ),
+        ),
+        (
+            'Language update - data.description',
+            dict(
+                template_root=_abs(
+                    'pgadmin', 'browser', 'server_groups', 'servers',
+                    'databases', 'languages', 'templates'),
+                template='languages/sql/default/update.sql',
+                ctx=dict(
+                    data=dict(name='plperl', description=PAYLOAD),
+                    o_data=dict(name='plperl', description='old',
+                                trusted=True, lanproc='h', laninl='i',
+                                lanval='v', lanowner='postgres'),
+                    conn=_FakeConn(),
+                ),
+            ),
+        ),
+        (
+            'Event trigger update - data.comment',
+            dict(
+                template_root=_abs(
+                    'pgadmin', 'browser', 'server_groups', 'servers',
+                    'databases', 'event_triggers', 'templates'),
+                template='event_triggers/sql/default/update.sql',
+                ctx=dict(
+                    data=dict(name='et1', comment=PAYLOAD),
+                    o_data=dict(name='et1', comment='old',
+                                eventname='ddl_command_start',
+                                eventfunname='public.f', eventowner='postgres',
+                                enabled='O'),
+                    conn=_FakeConn(),
+                ),
+            ),
+        ),
+        (
+            'View OID lookup (pg) - data.schema',
+            dict(
+                template_root=_abs(
+                    'pgadmin', 'browser', 'server_groups', 'servers',
+                    'databases', 'schemas', 'views', 'templates'),
+                template='views/pg/default/sql/view_id.sql',
+                ctx=dict(
+                    data=dict(name='v1', schema=PAYLOAD),
+                    conn=_FakeConn(),
+                ),
+            ),
+        ),
+        (
+            'View OID lookup (ppas) - data.schema',
+            dict(
+                template_root=_abs(
+                    'pgadmin', 'browser', 'server_groups', 'servers',
+                    'databases', 'schemas', 'views', 'templates'),
+                template='views/ppas/default/sql/view_id.sql',
+                ctx=dict(
+                    data=dict(name='v1', schema=PAYLOAD),
+                    conn=_FakeConn(),
+                ),
+            ),
+        ),
+    ]
+
+    def setUp(self):
+        self.app_under_test = _FakeApp(self.template_root)
+
+    def runTest(self):
+        with self.app_under_test.app_context():
+            rendered = render_template(self.template, **self.ctx)
+
+        self.assertIn(
+            SAFE_FRAGMENT, rendered,
+            msg=(
+                'Description was not safely escaped by qtLiteral.\n'
+                'Expected fragment: {}\n'
+                'Rendered output:\n{}'.format(SAFE_FRAGMENT, rendered)
+            ),
+        )
+        self.assertNotIn(
+            VULN_FRAGMENT, rendered,
+            msg=(
+                'Rendered SQL still contains the unescaped (vulnerable) '
+                'fragment.\nRendered output:\n{}'.format(rendered)
+            ),
+        )
+
+
+class _FakeApp(Flask):
+    """Minimal Flask app whose Jinja environment mirrors the production
+    template filters (``qtLiteral``, ``qtIdent``, ``qtTypeIdent``) and whose
+    loader can resolve both the entity's own templates and the macro files
+    they import."""
+
+    def __init__(self, template_root):
+        super().__init__('')
+        driver = get_driver(PG_DEFAULT_DRIVER, self)
+        self.jinja_env.filters['qtLiteral'] = driver.qtLiteral
+        self.jinja_env.filters['qtIdent'] = driver.qtIdent
+        self.jinja_env.filters['qtTypeIdent'] = driver.qtTypeIdent
+        self.jinja_loader = FileSystemLoader([template_root] + MACRO_ROOTS)
diff --git a/web/pgadmin/browser/server_groups/servers/databases/tests/test_sql_string_literal_lint.py b/web/pgadmin/browser/server_groups/servers/databases/tests/test_sql_string_literal_lint.py
new file mode 100644
index 000000000..f45becec4
--- /dev/null
+++ b/web/pgadmin/browser/server_groups/servers/databases/tests/test_sql_string_literal_lint.py
@@ -0,0 +1,511 @@
+##########################################################################
+#
+# pgAdmin 4 - PostgreSQL Tools
+#
+# Copyright (C) 2013 - 2026, The pgAdmin Development Team
+# This software is released under the PostgreSQL Licence
+#
+##########################################################################
+
+"""Lint regression test: every ``'{{ ... }}'`` Jinja interpolation in a SQL
+template is a potential SQL injection sink — the unquoted-then-quoted form
+relies on the substituted value being free of apostrophes, which is almost
+never enforceable across the codebase.
+
+The safe pattern is ``{{ value|qtLiteral(conn) }}`` (no surrounding quotes
+in the template — the filter wraps the value in PostgreSQL-escaped single
+quotes itself). See also ``test_comment_description_sql_escaping.py`` for
+the per-template behavioural test that exercises the COMMENT sites that
+motivated this lint.
+
+This test walks every ``*.sql`` template under ``web/pgadmin/`` and compares
+the set of single-quote-wrapped Jinja interpolations against an explicit
+allowlist. Each allowlist entry carries a short justification.
+
+If you see this test fail with a "new occurrence" message, you have two
+options:
+
+  1. Preferred: change ``'{{ x }}'`` to ``{{ x|qtLiteral(conn) }}`` in the
+     template. Make sure the ``render_template`` caller passes ``conn=`` so
+     the filter does not short-circuit.
+  2. If the value is provably safe (e.g. a numeric OID looked up from
+     pg_catalog, a hardcoded constant supplied by the handler, or a
+     bounded enum validated server-side), add an entry to ``ALLOWLIST``
+     below with a one-line reason.
+"""
+
+import os
+import re
+from collections import Counter
+
+from pgadmin.utils.route import BaseTestGenerator
+
+
+# Repository web/ directory.
+WEB_ROOT = os.path.realpath(
+    os.path.join(os.path.dirname(os.path.realpath(__file__)),
+                 os.pardir, os.pardir, os.pardir, os.pardir, os.pardir,
+                 os.pardir)
+)
+
+# Root inside web/ that the lint walks.
+SCAN_ROOT = os.path.join(WEB_ROOT, 'pgadmin')
+
+# Single-quote-wrapped Jinja interpolation. The expression body cannot
+# contain ``}`` because ``}}`` ends the Jinja tag.
+PATTERN = re.compile(r"'\{\{[^}]+\}\}'")
+
+
+# Allowlist of currently-known occurrences. Each entry is
+# ``((relative_path, matched_fragment), count, reason)`` where:
+#
+#   * ``relative_path`` is the SQL template path relative to ``web/``
+#     (forward slashes on every platform).
+#   * ``matched_fragment`` is the exact ``'{{ ... }}'`` slice as it appears
+#     in the template (whitespace inside the braces matters).
+#   * ``count`` is the number of times that fragment occurs in that file
+#     (a single long Jinja line can carry multiple identical fragments).
+#   * ``reason`` is a short justification: why this is not exploitable.
+#
+# Add new entries only when (1) the substituted value is genuinely safe by
+# construction, or (2) the impact is something other than SQL injection
+# against arbitrary data. Anything that takes free-form user input through
+# the request body MUST use ``qtLiteral`` instead of being allowlisted.
+
+ALLOWLIST = [
+    # ------------------------------------------------------------------
+    # Server-internal numeric OIDs. ``oid``/``tid`` are integers looked up
+    # from pg_catalog and rendered into a literal-shaped placeholder so
+    # they can be compared against text columns / cast back via regclass.
+    # Not user-supplied; cannot contain apostrophes.
+    # ------------------------------------------------------------------
+    (('pgadmin/browser/server_groups/servers/databases/schemas/types/'
+      'templates/types/pg/sql/default/get_subtypes.sql',
+      "'{{ oid }}'"), 1,
+     "OID is a server-internal integer from pg_catalog (proargtypes lookup)."),
+    (('pgadmin/browser/server_groups/servers/databases/schemas/types/'
+      'templates/types/ppas/sql/default/get_subtypes.sql',
+      "'{{ oid }}'"), 1,
+     "OID is a server-internal integer from pg_catalog (proargtypes lookup)."),
+    (('pgadmin/browser/server_groups/servers/databases/publications/'
+      'templates/publications/pg/default/sql/get_all_columns.sql',
+      "'{{ tid }}'"), 1,
+     "tid is a numeric table OID from the URL path, used with ::regclass."),
+    (('pgadmin/browser/server_groups/servers/databases/publications/'
+      'templates/publications/ppas/default/sql/get_all_columns.sql',
+      "'{{ tid }}'"), 1,
+     "tid is a numeric table OID from the URL path, used with ::regclass."),
+
+    # ------------------------------------------------------------------
+    # Fixed enum strings supplied by the dashboard module. The value
+    # passed for ``log_format`` is selected from the server's
+    # ``log_destination`` GUC and can only be ``csvlog``, ``stderr`` or
+    # ``jsonlog`` (the only values pg_current_logfile accepts).
+    # ------------------------------------------------------------------
+    (('pgadmin/dashboard/templates/dashboard/sql/default/logs.sql',
+      "'{{log_format}}'"), 1,
+     "log_format is a fixed enum (csvlog/stderr/jsonlog) from server GUC."),
+    (('pgadmin/dashboard/templates/dashboard/sql/default/log_stat.sql',
+      "'{{log_format}}'"), 1,
+     "log_format is a fixed enum (csvlog/stderr/jsonlog) from server GUC."),
+
+    # ------------------------------------------------------------------
+    # ``constraint_type`` is a single-char pg_constraint contype code
+    # ('c', 'f', 'p', 'u', 'x', ...) passed by pgAdmin's own handler when
+    # rendering one of these templates; never derived from request input.
+    # ------------------------------------------------------------------
+    (('pgadmin/browser/server_groups/servers/databases/schemas/tables/'
+      'templates/index_constraint/sql/15_plus/properties.sql',
+      "'{{constraint_type}}'"), 1,
+     "Single-char pg_constraint.contype code, hardcoded by handler."),
+    (('pgadmin/browser/server_groups/servers/databases/schemas/tables/'
+      'templates/index_constraint/sql/11_plus/properties.sql',
+      "'{{constraint_type}}'"), 1,
+     "Single-char pg_constraint.contype code, hardcoded by handler."),
+    (('pgadmin/browser/server_groups/servers/databases/schemas/tables/'
+      'templates/index_constraint/sql/default/properties.sql',
+      "'{{constraint_type}}'"), 1,
+     "Single-char pg_constraint.contype code, hardcoded by handler."),
+    (('pgadmin/browser/server_groups/servers/databases/schemas/tables/'
+      'templates/index_constraint/sql/default/get_oid.sql',
+      "'{{constraint_type}}'"), 1,
+     "Single-char pg_constraint.contype code, hardcoded by handler."),
+    (('pgadmin/browser/server_groups/servers/databases/schemas/tables/'
+      'templates/index_constraint/sql/default/get_oid_with_transaction.sql',
+      "'{{constraint_type}}'"), 1,
+     "Single-char pg_constraint.contype code, hardcoded by handler."),
+    (('pgadmin/browser/server_groups/servers/databases/schemas/tables/'
+      'templates/index_constraint/sql/default/get_name.sql',
+      "'{{constraint_type}}'"), 1,
+     "Single-char pg_constraint.contype code, hardcoded by handler."),
+    (('pgadmin/browser/server_groups/servers/databases/schemas/tables/'
+      'templates/index_constraint/sql/default/nodes.sql',
+      "'{{constraint_type}}'"), 1,
+     "Single-char pg_constraint.contype code, hardcoded by handler."),
+
+    # ------------------------------------------------------------------
+    # Index stat lookups for an already-existing table. ``schema`` and
+    # ``table`` come from the browser tree node and ultimately from
+    # pg_catalog. Cannot contain apostrophes for any object pgAdmin was
+    # able to discover via its own browse queries (which use qtLiteral on
+    # the way in), so this is not a SQL injection sink. A correctness
+    # follow-up (legitimately named objects containing apostrophes) is
+    # tracked separately.
+    # ------------------------------------------------------------------
+    (('pgadmin/browser/server_groups/servers/databases/schemas/tables/'
+      'templates/indexes/sql/default/coll_stats.sql',
+      "'{{schema}}'"), 1,
+     "Schema name from pg_catalog via browser tree, not request input."),
+    (('pgadmin/browser/server_groups/servers/databases/schemas/tables/'
+      'templates/indexes/sql/default/coll_stats.sql',
+      "'{{table}}'"), 1,
+     "Table name from pg_catalog via browser tree, not request input."),
+    (('pgadmin/browser/server_groups/servers/databases/schemas/tables/'
+      'templates/indexes/sql/16_plus/coll_stats.sql',
+      "'{{schema}}'"), 1,
+     "Schema name from pg_catalog via browser tree, not request input."),
+    (('pgadmin/browser/server_groups/servers/databases/schemas/tables/'
+      'templates/indexes/sql/16_plus/coll_stats.sql',
+      "'{{table}}'"), 1,
+     "Table name from pg_catalog via browser tree, not request input."),
+
+    # ------------------------------------------------------------------
+    # Aggregate initial-condition strings. ``initial_val`` and
+    # ``moving_initial_val`` come from the aggregate-creation form. The
+    # session executing the SQL must already hold ``CREATE`` on the
+    # target schema (CREATE AGGREGATE requirement), so the user can
+    # already issue arbitrary SQL via Query Tool. Tracked as a
+    # consistency follow-up; not a privilege-escalation sink.
+    # ------------------------------------------------------------------
+    (('pgadmin/browser/server_groups/servers/databases/schemas/aggregates/'
+      'templates/aggregates/sql/11_plus/create.sql',
+      "'{{data.initial_val}}'"), 1,
+     "CREATE AGGREGATE requires CREATE on schema; user already has SQL "
+     "access. Tracked as consistency follow-up."),
+    (('pgadmin/browser/server_groups/servers/databases/schemas/aggregates/'
+      'templates/aggregates/sql/11_plus/create.sql',
+      "'{{data.moving_initial_val}}'"), 1,
+     "CREATE AGGREGATE requires CREATE on schema; user already has SQL "
+     "access. Tracked as consistency follow-up."),
+    (('pgadmin/browser/server_groups/servers/databases/schemas/aggregates/'
+      'templates/aggregates/sql/12_plus/create.sql',
+      "'{{data.initial_val}}'"), 1,
+     "CREATE AGGREGATE requires CREATE on schema; user already has SQL "
+     "access. Tracked as consistency follow-up."),
+    (('pgadmin/browser/server_groups/servers/databases/schemas/aggregates/'
+      'templates/aggregates/sql/12_plus/create.sql',
+      "'{{data.moving_initial_val}}'"), 1,
+     "CREATE AGGREGATE requires CREATE on schema; user already has SQL "
+     "access. Tracked as consistency follow-up."),
+    (('pgadmin/browser/server_groups/servers/databases/schemas/aggregates/'
+      'templates/aggregates/sql/default/create.sql',
+      "'{{data.initial_val}}'"), 1,
+     "CREATE AGGREGATE requires CREATE on schema; user already has SQL "
+     "access. Tracked as consistency follow-up."),
+    (('pgadmin/browser/server_groups/servers/databases/schemas/aggregates/'
+      'templates/aggregates/sql/default/create.sql',
+      "'{{data.moving_initial_val}}'"), 1,
+     "CREATE AGGREGATE requires CREATE on schema; user already has SQL "
+     "access. Tracked as consistency follow-up."),
+
+    # ------------------------------------------------------------------
+    # Subscription create/update parameters. ``sync`` (synchronous_commit
+    # value), ``streaming`` (on/off/parallel), and ``origin`` (any/none)
+    # are bounded enum values selected from form drop-downs; the
+    # subscription form schema rejects free-form input. Subscription
+    # management additionally requires the user to be a superuser
+    # (CREATE SUBSCRIPTION). Tracked as a consistency follow-up.
+    # ------------------------------------------------------------------
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/default/create.sql',
+      "'{{ data.sync }}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/default/update.sql',
+      "'{{ data.sync }}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/14_plus/create.sql',
+      "'{{ data.sync }}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/14_plus/create.sql',
+      "'{{ data.streaming}}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/14_plus/update.sql',
+      "'{{ data.sync }}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/14_plus/update.sql',
+      "'{{ data.streaming}}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/15_plus/create.sql',
+      "'{{ data.sync }}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/15_plus/create.sql',
+      "'{{ data.streaming}}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/15_plus/update.sql',
+      "'{{ data.sync }}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/15_plus/update.sql',
+      "'{{ data.streaming}}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/16_plus/create.sql',
+      "'{{ data.sync }}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/16_plus/create.sql',
+      "'{{ data.streaming}}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/16_plus/create.sql',
+      "'{{ data.origin}}'"), 1,
+     "Bounded enum (any/none); CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/16_plus/update.sql',
+      "'{{ data.sync }}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/16_plus/update.sql',
+      "'{{ data.streaming }}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/16_plus/update.sql',
+      "'{{ data.origin }}'"), 1,
+     "Bounded enum (any/none); CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/17_plus/create.sql',
+      "'{{ data.sync }}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/17_plus/create.sql',
+      "'{{ data.streaming}}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/17_plus/create.sql',
+      "'{{ data.origin}}'"), 1,
+     "Bounded enum (any/none); CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/17_plus/update.sql',
+      "'{{ data.sync }}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/17_plus/update.sql',
+      "'{{ data.streaming }}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/17_plus/update.sql',
+      "'{{ data.origin }}'"), 1,
+     "Bounded enum (any/none); CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/18_plus/update.sql',
+      "'{{ data.sync }}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/18_plus/update.sql',
+      "'{{ data.streaming }}'"), 1,
+     "Bounded enum from form schema; CREATE SUBSCRIPTION needs superuser."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/18_plus/update.sql',
+      "'{{ data.origin }}'"), 1,
+     "Bounded enum (any/none); CREATE SUBSCRIPTION needs superuser."),
+
+    # ------------------------------------------------------------------
+    # Subscription / publication name lookups. ``subname``, ``pubname``
+    # and ``pname`` come from the browser tree (resolved from OID
+    # references in pg_catalog), not from request body input.
+    # ------------------------------------------------------------------
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/default/get_position.sql',
+      "'{{ subname }}'"), 1,
+     "Subscription name from pg_catalog via browser tree."),
+    (('pgadmin/browser/server_groups/servers/databases/subscriptions/'
+      'templates/subscriptions/sql/default/dependencies.sql',
+      "'{{subname}}'"), 1,
+     "Subscription name from pg_catalog via browser tree."),
+    (('pgadmin/browser/server_groups/servers/databases/publications/'
+      'templates/publications/pg/default/sql/get_position.sql',
+      "'{{ pubname }}'"), 1,
+     "Publication name from pg_catalog via browser tree."),
+    (('pgadmin/browser/server_groups/servers/databases/publications/'
+      'templates/publications/pg/default/sql/dependencies.sql',
+      "'{{ pname }}'"), 1,
+     "Publication name from pg_catalog via browser tree."),
+    (('pgadmin/browser/server_groups/servers/databases/publications/'
+      'templates/publications/ppas/default/sql/get_position.sql',
+      "'{{ pubname }}'"), 1,
+     "Publication name from pg_catalog via browser tree."),
+    (('pgadmin/browser/server_groups/servers/databases/publications/'
+      'templates/publications/ppas/default/sql/dependencies.sql',
+      "'{{ pname }}'"), 1,
+     "Publication name from pg_catalog via browser tree."),
+
+    # ------------------------------------------------------------------
+    # DBMS job scheduler ``CREATE`` templates emit lines that are entirely
+    # inside SQL ``--`` line comments (display-only headers, never
+    # executed by pgAdmin). Each scheduler entity has two such lines.
+    # ------------------------------------------------------------------
+    (('pgadmin/browser/server_groups/servers/databases/dbms_job_scheduler/'
+      'dbms_jobs/templates/dbms_jobs/ppas/16_plus/create.sql',
+      "'{{ job_name }}'"), 2,
+     "Inside ``--`` SQL line comment (display header), not executed."),
+    (('pgadmin/browser/server_groups/servers/databases/dbms_job_scheduler/'
+      'dbms_schedules/templates/dbms_schedules/ppas/16_plus/create.sql',
+      "'{{ schedule_name }}'"), 2,
+     "Inside ``--`` SQL line comment (display header), not executed."),
+    (('pgadmin/browser/server_groups/servers/databases/dbms_job_scheduler/'
+      'dbms_programs/templates/dbms_programs/ppas/16_plus/create.sql',
+      "'{{ program_name }}'"), 2,
+     "Inside ``--`` SQL line comment (display header), not executed."),
+
+    # ------------------------------------------------------------------
+    # grant_wizard SQL templates emit hardcoded display/typing constants
+    # (object_type, icon, prokind, relkind, node_type) that the wizard's
+    # own handler supplies as fixed string literals — not user input.
+    # ------------------------------------------------------------------
+    (('pgadmin/tools/grant_wizard/templates/grant_wizard/pg/default/sql/'
+      'function.sql', "'{{ func_type }}'"), 1,
+     "Hardcoded display constant supplied by grant_wizard handler."),
+    (('pgadmin/tools/grant_wizard/templates/grant_wizard/pg/default/sql/'
+      'function.sql', "'{{ icon }}'"), 1,
+     "Hardcoded display constant supplied by grant_wizard handler."),
+    (('pgadmin/tools/grant_wizard/templates/grant_wizard/pg/default/sql/'
+      'view.sql', "'{{ ntype }}'"), 1,
+     "Hardcoded display constant supplied by grant_wizard handler."),
+    (('pgadmin/tools/grant_wizard/templates/grant_wizard/pg/default/sql/'
+      'view.sql', "'{{ node_type }}'"), 1,
+     "Hardcoded pg_class.relkind char supplied by grant_wizard handler."),
+    (('pgadmin/tools/grant_wizard/templates/grant_wizard/pg/11_plus/sql/'
+      'function.sql', "'{{ func_type }}'"), 1,
+     "Hardcoded display constant supplied by grant_wizard handler."),
+    (('pgadmin/tools/grant_wizard/templates/grant_wizard/pg/11_plus/sql/'
+      'function.sql', "'{{ icon }}'"), 1,
+     "Hardcoded display constant supplied by grant_wizard handler."),
+    (('pgadmin/tools/grant_wizard/templates/grant_wizard/pg/11_plus/sql/'
+      'function.sql', "'{{ kind }}'"), 1,
+     "Hardcoded pg_proc.prokind char supplied by grant_wizard handler."),
+    (('pgadmin/tools/grant_wizard/templates/grant_wizard/ppas/default/sql/'
+      'function.sql', "'{{ func_type }}'"), 1,
+     "Hardcoded display constant supplied by grant_wizard handler."),
+    (('pgadmin/tools/grant_wizard/templates/grant_wizard/ppas/default/sql/'
+      'function.sql', "'{{ icon }}'"), 1,
+     "Hardcoded display constant supplied by grant_wizard handler."),
+    (('pgadmin/tools/grant_wizard/templates/grant_wizard/ppas/default/sql/'
+      'view.sql', "'{{ ntype }}'"), 1,
+     "Hardcoded display constant supplied by grant_wizard handler."),
+    (('pgadmin/tools/grant_wizard/templates/grant_wizard/ppas/default/sql/'
+      'view.sql', "'{{ view_icon }}'"), 1,
+     "Hardcoded display constant supplied by grant_wizard handler."),
+    (('pgadmin/tools/grant_wizard/templates/grant_wizard/ppas/default/sql/'
+      'view.sql', "'{{ node_type }}'"), 1,
+     "Hardcoded pg_class.relkind char supplied by grant_wizard handler."),
+    (('pgadmin/tools/grant_wizard/templates/grant_wizard/ppas/11_plus/sql/'
+      'function.sql', "'{{ func_type }}'"), 1,
+     "Hardcoded display constant supplied by grant_wizard handler."),
+    (('pgadmin/tools/grant_wizard/templates/grant_wizard/ppas/11_plus/sql/'
+      'function.sql', "'{{ icon }}'"), 1,
+     "Hardcoded display constant supplied by grant_wizard handler."),
+    (('pgadmin/tools/grant_wizard/templates/grant_wizard/ppas/11_plus/sql/'
+      'function.sql', "'{{ kind }}'"), 1,
+     "Hardcoded pg_proc.prokind char supplied by grant_wizard handler."),
+
+    # ------------------------------------------------------------------
+    # search_objects: ``obj_type`` is one of the fixed object-kind strings
+    # baked into the search handler's own dispatch table.
+    # ------------------------------------------------------------------
+    (('pgadmin/tools/search_objects/templates/search_objects/sql/ppas/'
+      '11_plus/search.sql', "'{{ obj_type }}'"), 1,
+     "Fixed object-kind enum supplied by search_objects handler."),
+    (('pgadmin/tools/search_objects/templates/search_objects/sql/ppas/'
+      '12_plus/search.sql', "'{{ obj_type }}'"), 1,
+     "Fixed object-kind enum supplied by search_objects handler."),
+    (('pgadmin/tools/search_objects/templates/search_objects/sql/ppas/'
+      'default/search.sql', "'{{ obj_type }}'"), 1,
+     "Fixed object-kind enum supplied by search_objects handler."),
+]
+
+
+def _scan_sql_templates():
+    """Return Counter[(rel_path, fragment)] of every ``'{{ ... }}'``
+    occurrence under SCAN_ROOT."""
+    counter = Counter()
+    for dirpath, _dirs, files in os.walk(SCAN_ROOT):
+        for fname in files:
+            if not fname.endswith('.sql'):
+                continue
+            full = os.path.join(dirpath, fname)
+            rel = os.path.relpath(full, WEB_ROOT).replace(os.sep, '/')
+            with open(full, encoding='utf-8') as fh:
+                for line in fh:
+                    for m in PATTERN.finditer(line):
+                        counter[(rel, m.group(0))] += 1
+    return counter
+
+
+def _allowlist_counter():
+    counter = Counter()
+    for key, count, _reason in ALLOWLIST:
+        counter[key] += count
+    return counter
+
+
+def _allowlist_reasons():
+    return {key: reason for key, _count, reason in ALLOWLIST}
+
+
+class SQLStringLiteralInterpolationLintTestCase(BaseTestGenerator):
+    """Fail if any new ``'{{ ... }}'`` single-quote-wrapped Jinja
+    interpolation appears in a SQL template without being either replaced
+    with ``qtLiteral`` or added to ``ALLOWLIST`` above."""
+
+    scenarios = [('Lint *.sql templates for unescaped Jinja literals',
+                  dict())]
+
+    def runTest(self):
+        actual = _scan_sql_templates()
+        expected = _allowlist_counter()
+        reasons = _allowlist_reasons()
+
+        new = []      # found in code, not allowlisted (or count too high)
+        stale = []    # allowlisted, not found in code (or count too low)
+
+        for key, n in actual.items():
+            allowed = expected.get(key, 0)
+            if n > allowed:
+                new.append((key, n - allowed))
+
+        for key, n in expected.items():
+            present = actual.get(key, 0)
+            if n > present:
+                stale.append((key, n - present, reasons[key]))
+
+        messages = []
+        if new:
+            lines = [
+                ('FOUND unallowed single-quote-wrapped Jinja '
+                 'interpolations. Replace with `{{ x|qtLiteral(conn) }}` '
+                 '(no surrounding quotes) — and pass conn= to '
+                 'render_template — or add an explicit ALLOWLIST entry '
+                 'in test_sql_string_literal_lint.py with a reason.\n')
+            ]
+            for (rel, frag), n in sorted(new):
+                lines.append('  + {} :: {} (x{})'.format(rel, frag, n))
+            messages.append('\n'.join(lines))
+        if stale:
+            lines = [
+                ('STALE ALLOWLIST entries (no longer present in code). '
+                 'Remove them from test_sql_string_literal_lint.py.\n')
+            ]
+            for (rel, frag), n, reason in sorted(stale):
+                lines.append('  - {} :: {} (x{})  // {}'
+                             .format(rel, frag, n, reason))
+            messages.append('\n'.join(lines))
+        if messages:
+            self.fail('\n\n'.join(messages))
diff --git a/web/pgadmin/browser/server_groups/servers/roles/__init__.py b/web/pgadmin/browser/server_groups/servers/roles/__init__.py
index 97be3b2a9..a2f407cda 100644
--- a/web/pgadmin/browser/server_groups/servers/roles/__init__.py
+++ b/web/pgadmin/browser/server_groups/servers/roles/__init__.py
@@ -733,7 +733,8 @@ rolmembership:{
     def list(self, gid, sid):
         status, res = self.conn.execute_dict(
             render_template(
-                self.sql_path + self._PROPERTIES_SQL
+                self.sql_path + self._PROPERTIES_SQL,
+                conn=self.conn
             )
         )
 
@@ -752,7 +753,8 @@ rolmembership:{
     def nodes(self, gid, sid):
 
         status, rset = self.conn.execute_2darray(
-            render_template(self.sql_path + self._NODES_SQL)
+            render_template(self.sql_path + self._NODES_SQL,
+                            conn=self.conn)
         )
 
         if not status:
@@ -783,7 +785,7 @@ rolmembership:{
         status, rset = self.conn.execute_2darray(
             render_template(
                 self.sql_path + self._NODES_SQL,
-                rid=rid
+                rid=rid, conn=self.conn
             )
         )
 
@@ -877,7 +879,7 @@ rolmembership:{
         status, res = self.conn.execute_dict(
             render_template(
                 self.sql_path + self._PROPERTIES_SQL,
-                rid=rid
+                rid=rid, conn=self.conn
             )
         )
 
@@ -998,7 +1000,7 @@ rolmembership:{
 
         status, rset = self.conn.execute_dict(
             render_template(self.sql_path + self._NODES_SQL,
-                            rid=rid
+                            rid=rid, conn=self.conn
                             )
         )
 
@@ -1042,7 +1044,7 @@ rolmembership:{
 
         status, rset = self.conn.execute_dict(
             render_template(self.sql_path + self._NODES_SQL,
-                            rid=rid
+                            rid=rid, conn=self.conn
                             )
         )
 
@@ -1280,7 +1282,7 @@ rolmembership:{
 
         status, rset = self.conn.execute_dict(
             render_template(self.sql_path + 'variables.sql',
-                            rid=rid
+                            rid=rid, conn=self.conn
                             )
         )
 
diff --git a/web/pgadmin/utils/driver/psycopg3/__init__.py b/web/pgadmin/utils/driver/psycopg3/__init__.py
index 067215aff..989fe1405 100644
--- a/web/pgadmin/utils/driver/psycopg3/__init__.py
+++ b/web/pgadmin/utils/driver/psycopg3/__init__.py
@@ -309,16 +309,23 @@ class Driver(BaseDriver):
 
     @staticmethod
     def qtLiteral(value, conn, force_quote=False):
-        res = value
+        if not conn:
+            raise ValueError(
+                "qtLiteral requires a connection: without one, escaping "
+                "silently degrades to returning the raw value, which is a "
+                "SQL injection sink. When using the Jinja filter, ensure "
+                "render_template is called with conn=<conn>; when calling "
+                "from Python, pass the connection as the second argument."
+            )
 
-        if conn:
-            try:
-                if not isinstance(conn, psycopg.Connection) and \
-                        not isinstance(conn, psycopg.AsyncConnection):
-                    conn = conn.conn
-                res = psycopg.sql.Literal(value).as_string(conn).strip()
-            except Exception:
-                print("Exception", value)
+        res = value
+        try:
+            if not isinstance(conn, psycopg.Connection) and \
+                    not isinstance(conn, psycopg.AsyncConnection):
+                conn = conn.conn
+            res = psycopg.sql.Literal(value).as_string(conn).strip()
+        except Exception:
+            print("Exception", value)
 
         if force_quote is True:
             # Convert the input to the string to use the startsWith(...)
diff --git a/web/pgadmin/utils/tests/test_qtliteral_requires_conn.py b/web/pgadmin/utils/tests/test_qtliteral_requires_conn.py
new file mode 100644
index 000000000..586c8b414
--- /dev/null
+++ b/web/pgadmin/utils/tests/test_qtliteral_requires_conn.py
@@ -0,0 +1,34 @@
+##########################################################################
+#
+# pgAdmin 4 - PostgreSQL Tools
+#
+# Copyright (C) 2013 - 2026, The pgAdmin Development Team
+# This software is released under the PostgreSQL Licence
+#
+##########################################################################
+
+"""Unit test: ``qtLiteral`` must refuse to escape without a connection.
+
+Historically, ``qtLiteral`` silently short-circuited when its ``conn``
+argument was falsy and returned the raw value unchanged. Combined with
+templates that wrapped the result in single quotes (``'{{ x|qtLiteral }}'``
+or callers that forgot to pass ``conn=`` to ``render_template``), this
+produced unescaped SQL string literals that allowed apostrophe-based
+injection. The driver now raises so the failure is loud."""
+
+from pgadmin.utils.driver import get_driver
+from pgadmin.utils.route import BaseTestGenerator
+from config import PG_DEFAULT_DRIVER
+
+
+class QtLiteralRequiresConnTestCase(BaseTestGenerator):
+
+    scenarios = [('qtLiteral raises ValueError when conn is falsy', dict())]
+
+    def runTest(self):
+        driver = get_driver(PG_DEFAULT_DRIVER)
+        for bad in (None, 0, '', False):
+            with self.assertRaises(ValueError) as ctx:
+                driver.qtLiteral("any value", bad)
+            self.assertIn('qtLiteral requires a connection',
+                          str(ctx.exception))