* docs: self-host fonts, images, and OpenAPI icons; block build egress Stop hotlinking GitHub/user-images and Google Fonts on the docs site, replace embedded video iframes with links, and fail CI when a build would fetch off-origin resources (closed allowlist for the security-updates feed). Co-authored-by: Cursor <cursoragent@cursor.com> * docs: address CodeRabbit egress review findings Scan an offline (no-Algolia) rebuild in Docs CI, tighten ATTR/getAttr boundaries, flag remote template-literal prefixes before ${, and add alt text for the self-hosted plugin-management image. Co-authored-by: Cursor <cursoragent@cursor.com> * docs: replace egress fixture tree with in-memory unit tests Keep scanner coverage without committing dozens of tiny HTML/CSS/JS fixture files. scanSources takes string maps; CLI smoke uses a temp dir. Co-authored-by: Cursor <cursoragent@cursor.com> * docs: keep YouTube/Wistia embeds on hosted site Restore in-page players for the public docs. Allowlist those hosts in check-egress; the offline packager strips them for airgap. Co-authored-by: Cursor <cursoragent@cursor.com> * docs: simplify hosted-embed allowlist to base domains Co-authored-by: Cursor <cursoragent@cursor.com> * docs: tighten hosted-embed allowlist to player kinds and paths Only iframe/script/img player URLs pass; fetch() and other loads to YouTube/Wistia hosts still fail egress. Co-authored-by: Cursor <cursoragent@cursor.com> * docs: allow Wistia swatch preload in hosted-embed egress check The organize-conversations embed emits link[rel=preload] for the swatch; kind-scoped allowlisting missed it and failed Docs CI. Co-authored-by: Cursor <cursoragent@cursor.com> * docs: use getAttr boundary for script hasSrc check \b matches inside data-src, so the old hasSrc could skip scanning an inline script body. Align with ATTR/getAttr and cover the case in tests. Co-authored-by: Cursor <cursoragent@cursor.com> --------- Co-authored-by: Cursor <cursoragent@cursor.com>
Mattermost is an open core, self-hosted collaboration platform that offers chat, workflow automation, voice calling, screen sharing, and AI integration. This repo is the primary source for core development on the Mattermost platform; it's written in Go and React, runs as a single Linux binary, and relies on PostgreSQL. A new compiled version is released under an MIT license every month on the 16th.
Deploy Mattermost on-premises, or try it for free in the cloud.
Learn more about the following use cases with Mattermost:
Other useful resources:
- Download and Install Mattermost - Install, setup, and configure your own Mattermost instance.
- Product documentation - Learn how to run a Mattermost instance and take advantage of all the features.
- Developer documentation - Contribute code to Mattermost or build an integration via APIs, Webhooks, slash commands, Apps, and plugins.
Table of contents
- Install Mattermost
- Native mobile and desktop apps
- Get security bulletins
- Get involved
- Learn more
- License
- Get the latest news
- Contributing
Install Mattermost
- Download and Install Mattermost Self-Hosted - Deploy a Mattermost Self-hosted instance in minutes via Docker, Ubuntu, or tar.
- Get started in the cloud to try Mattermost today.
- Developer machine setup - Follow this guide if you want to write code for Mattermost.
Other install guides:
- Deploy Mattermost on Docker
- Mattermost Omnibus
- Install Mattermost from Tar
- Ubuntu 20.04 LTS
- Kubernetes
- Helm
- More server install guides
Native mobile and desktop apps
In addition to the web interface, you can also download Mattermost clients for Android, iOS, Windows PC, macOS, and Linux.
Get security bulletins
Receive notifications of critical security updates. The sophistication of online attackers is perpetually increasing. If you're deploying Mattermost it's highly recommended you subscribe to the Mattermost Security Bulletin mailing list for updates on critical security releases.
Get involved
- Contribute to Mattermost
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- Join Developer Discussion on a Mattermost server for contributors
- Get Help With Mattermost
Learn more
- API options - webhooks, slash commands, drivers, and web service
- See who's using Mattermost
- Browse over 700 Mattermost integrations
License
See the LICENSE file for license rights and limitations.
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- Facebook - Follow Mattermost on Facebook.
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- Mattermost - Join the ~contributors channel on the Mattermost Community Server.
- IRC - Join the #matterbridge channel on Freenode (thanks to matterircd).
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Contributing
Please see CONTRIBUTING.md. Join the Mattermost Contributors server to join community discussions about contributions, development, and more.




