Mattermost 9.x — End of Life
EOLMattermost 9.x — All releases
| Version | Released | Active support | EOL date | Latest patch | Status |
|---|---|---|---|---|---|
| 9.11LTS | Aug 2, 2024 | — | May 15, 2025 | 9.11.18 | EOL |
| 9.10 | Jun 28, 2024 | — | Oct 15, 2024 | 9.10.3 | EOL |
| 9.9 | May 31, 2024 | — | Sep 15, 2024 | 9.9.3 | EOL |
| 9.8 | May 3, 2024 | — | Aug 15, 2024 | 9.8.3 | EOL |
| 9.7 | Apr 3, 2024 | — | Jul 15, 2024 | 9.7.6 | EOL |
| 9.6 | Mar 1, 2024 | — | Jun 15, 2024 | 9.6.3 | EOL |
| 9.5 | Feb 2, 2024 | — | Nov 15, 2024 | 9.5.14 | EOL |
| 9.4 | Jan 8, 2024 | — | Apr 15, 2024 | 9.4.5 | EOL |
| 9.3 | Dec 5, 2023 | — | Mar 15, 2024 | 9.3.3 | EOL |
| 9.2 | Nov 6, 2023 | — | Feb 15, 2024 | 9.2.6 | EOL |
| 9.1 | Oct 13, 2023 | — | Jan 15, 2024 | 9.1.5 | EOL |
| 9.0 | Sep 14, 2023 | — | Dec 15, 2023 | 9.0.5 | EOL |
CVEs affecting Mattermost 9.x (0)
Mattermost 9.x is EOL — migrate to Mattermost 10.x
Mattermost 10.x is the next major release. Plan your upgrade before Mattermost 9.x stops receiving security patches.
Frequently asked questions
Is Mattermost 9 end of life?
Yes. All Mattermost 9.x releases have reached end of life and no longer receive security patches. Migrate to Mattermost 10.x as soon as possible.
What CVEs affect Mattermost 9?
No CVEs are currently tracked for Mattermost 9.x in our database. This may mean no vulnerabilities have been recorded yet, or the data is still syncing.
What is the latest Mattermost 9 version?
The latest Mattermost 9.x patch release is 9.11.18, released on July 22, 2025. Always run the latest patch to benefit from all security fixes.
How to migrate from Mattermost 9 to Mattermost 10?
To migrate from Mattermost 9 to Mattermost 10: (1) review the official Mattermost 10 migration guide for breaking changes, (2) update dependencies and configuration accordingly, (3) test thoroughly in a staging environment, (4) deploy with a rollback plan. Starting early gives you time to resolve compatibility issues before your current version reaches end of life.
Is it safe to run Mattermost 9 in production?
No. Mattermost 9 has reached end of life and security vulnerabilities are no longer patched. Upgrade to a supported version immediately.
Data sourced from endoflife.date · CVE data from NVD · EPSS from FIRST.org · KEV from CISA