Mattermost 11.5 · Version Status
Mattermost 11.5 End of Life Date
Mattermost 11.5 end-of-life date, support status, and CVE risk. Data from endoflife.date and official vendor documentation.
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Mattermost 11.5 reaches end of life on June 15, 2026. Plan your migration now — 37 days remaining.
EOL Date
Jun 15, 2026
37 days remaining
Latest Release
11.5.4
Standard release
Release Date
Mar 16, 2026
Mattermost 11.5 series
| Version | Latest | EOL Date | Status |
|---|
| 6.0 |
6.0.4 |
Jan 15, 2022 |
EOL |
| 6.1 |
6.1.3 |
Feb 15, 2022 |
EOL |
| 6.2 |
6.2.5 |
Mar 15, 2022 |
EOL |
| 6.3 LTS |
6.3.10 |
Oct 15, 2022 |
EOL |
| 6.4 |
6.4.3 |
May 15, 2022 |
EOL |
| 6.5 |
6.5.2 |
Jun 15, 2022 |
EOL |
| 6.6 |
6.6.2 |
Jul 15, 2022 |
EOL |
| 6.7 |
6.7.2 |
Aug 15, 2022 |
EOL |
What does Mattermost 11.5 end of life mean?
When Mattermost 11.5 reaches end of life, the maintainers stop issuing security patches for this version. CVEs discovered after the EOL date are publicly disclosed on the National Vulnerability Database with no patch available. Exploit code frequently appears on GitHub within days of disclosure.
The CVE blind spot: Most vulnerability scanners check for known CVEs but do not flag the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Running Mattermost 11.5 past its EOL date creates a permanently growing attack surface that standard security tooling will not surface.
Migrate to a supported version or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Mattermost 11.5 reach end of life?
Mattermost 11.5 reached end of life on June 15, 2026. That is 37 days remaining.
Is Mattermost 11.5 still supported?
Mattermost 11.5 is still supported but approaching end of life on June 15, 2026. Begin planning your migration now.
What should I upgrade to from Mattermost 11.5?
What are the security risks of running Mattermost 11.5 past EOL?
When Mattermost 11.5 reaches end of life, the maintainers stop issuing security patches. Any CVEs disclosed after the EOL date accumulate with no remediation path. Most vulnerability scanners do not flag this — it is the CVE blind spot. Organizations running EOL Mattermost should migrate immediately or implement compensating controls.