The current version of Mattermost is 11.11.1 (as of 24/09/2026). patchletter checks the official source daily and emails you new releases.
BSI security advisories
Advisories the German BSI (CERT-Bund) published for this product. Whether your version is affected is stated in the advisory itself.
- Mattermost Server: Mehrere Schwachstellen
WID-SEC-W-2026-3519 · 23 Sept
- Mattermost Desktop: Mehrere Schwachstellen
WID-SEC-W-2026-2876 · 18 Sept
- Mattermost Server: Mehrere Schwachstellen
WID-SEC-W-2026-3361 · 15 Sept
- Mattermost: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff
WID-SEC-W-2026-2411 · 18 Aug
- Mattermost Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff
WID-SEC-W-2026-2840 · 14 Aug
- Mattermost Server: Mehrere Schwachstellen
WID-SEC-W-2026-2107 · 28 Jul
- Mattermost: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff
WID-SEC-W-2026-1932 · 14 Jul
- Mattermost Server und Plugins: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff
WID-SEC-W-2026-1705 · 29 Jun
Mattermost at a glance
Mattermost is a widely used open-source, self-hosted team-messaging platform — an alternative to public chat services, common where data control matters. Mattermost ships regular releases (ESR and standard) plus security fixes; as a collaboration system holding sensitive conversations, hardening and timely updates matter.
For admins the ESR (extended-support) line is the calmer choice for production. Updates run database migrations — back up the database and the file store first, and follow the documented upgrade path without skipping required stops. Mattermost belongs behind TLS with strong authentication (SSO, two-factor) and off the open internet unless deliberately hardened. Integrations, plugins and bots carry their own access — review them. After upgrading, verify login, messaging and integrations. Track the version and its support window, and apply security releases promptly; patchletter surfaces new Mattermost releases.
Support cycles (endoflife.date)
| Cycle | Latest version | Status |
|---|---|---|
| 11.11 | 11.11.1 | EOL in 66 days |
| 11.10 | 11.10.2 | EOL in 36 days |
| 11.9 | 11.9.2 | EOL in 5 days |
| 11.8 | 11.8.5 | End of Life |
| 11.7 | 11.7.12 | EOL 15 May 27 |
| 11.6 | 11.6.6 | End of Life |
| 11.5 | 11.5.7 | End of Life |
| 11.4 | 11.4.5 | End of Life |
Version history & changelog · as detected by patchletter
| Version | Channel | Date | Notes |
|---|---|---|---|
| 11.11.1 | STABLE | 24/09/2026 | – |
| 11.11.0 | STABLE | 07/09/2026 | – |
| 11.10.2 | STABLE | 15/09/2026 | – |
| 11.10.1 | STABLE | 24/08/2026 | – |
| 11.10.0 | STABLE | 04/08/2026 | – |
| 11.9.1 | STABLE | 13/08/2026 | – |
| 11.9.0 | STABLE | 08/07/2026 | – |
| 11.8.4 | STABLE | 17/07/2026 | – |
| 11.8.3 | STABLE | 06/07/2026 | – |
| 11.8.2 | STABLE | 25/06/2026 | – |
Frequently asked questions
- What is the latest version of Mattermost?
- Mattermost 11.11.1, released 24/09/2026. patchletter checks the vendor's official source daily for new releases.
- Where can I find the Mattermost release notes?
- The version history above links to the vendor's official release notes where the vendor publishes them. patchletter deliberately stores no vendor full texts.
- How do I get notified about new Mattermost updates?
- Tick Mattermost off in the catalogue and leave your address. From then on new versions go out by email — one at a time, or bundled in the daily or weekly digest.
An email as soon as a new Mattermost version ships
We reconcile the vendor source daily. When a new version appears, it lands in your inbox right away or bundled as a digest. The update email is free and ends with one click. Alerts about vulnerabilities and end of support are part of patchletter Pro.
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[](https://patchletter.com/en/software/mattermost)https://patchletter.com/badge/mattermost.svgAlso available: ?v=eol (end of support) and ?v=cve (actively exploited).
