Mattermost 12.0 · Version Status
Mattermost 12.0 End of Life Date
Mattermost 12.0 end-of-life date, support status, and CVE risk. Data reconciled from official vendor documentation and endoflife.date at every build; the source of each date is on the product page.
⚡
Mattermost 12.0 reaches end of life on January 15, 2027. Plan your migration now — 85 days remaining.
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EOL Date
Jan 15, 2027
85 days remaining
Latest Release
12.0.0
Standard release
Release Date
Oct 16, 2026
Mattermost 12.0 series
Where these dates come from
End of lifeJan 15, 2027endoflife.date (open dataset) · endoflife.datemedium · 1 source agrees ReleaseOct 16, 2026endoflife.date (open dataset) · endoflife.datemedium · 1 source agrees Confidence: high = two or more independent sources agree (the vendor's page read by our adapter, a person's check against the vendor, the dataset the date came from); medium = one; low = the vendor page disagrees or our last read is stale.
How we source dates.
Lifecycle detail
Mattermost 12.0 was released on October 16, 2026 and support is scheduled to end on January 15, 2027 — a planned supported lifespan of 3 months, in line with the 3 months median for Mattermost releases. It is not an LTS release; Mattermost reserves longer patch windows for its LTS versions. Its most recent patch is 12.0.0, published October 14, 2026.
Attack Surface
10/30 Medium tier
CISA KEV Exposure
0/20 Not in KEV
Extended Support
0/10 Available
EOL Risk Score™ — proprietary methodology by endoflife.ai. Factors: EOL recency, attack surface breadth, CISA KEV catalog presence, extended support availability. Updated at every build.
Methodology → ·
View score card →
Extended Support
Extended Mattermost 12.0 support options
Some vendors and third parties sell security patches beyond end of life; whether one covers this version varies. Compare your options.
Compare Options →
| 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 12.0 end of life mean?
When Mattermost 12.0 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: A CVE-based scan does not show the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Some scanners flag unsupported versions of common products, but coverage varies, and none of them give you the date in advance. Running Mattermost 12.0 past its EOL date creates a growing attack surface that a clean scan result does not rule out.
Migrate to Mattermost 11.7 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.
Frequently Asked Questions
When does Mattermost 12.0 reach end of life?
Mattermost 12.0 reaches end of life on January 15, 2027. That is 85 days remaining.
Is Mattermost 12.0 still supported?
Mattermost 12.0 is still supported but approaching end of life on January 15, 2027. Begin planning your migration now.
What should I upgrade to from Mattermost 12.0?
The recommended upgrade from Mattermost 12.0 is
Mattermost 11.7 — the latest actively supported version. Check the
Mattermost full timeline for all supported versions.
What are the security risks of running Mattermost 12.0 past EOL?
When Mattermost 12.0 reaches end of life, the maintainers stop issuing security patches. Any CVEs disclosed after the EOL date accumulate with no vendor fix. A CVE-based scan does not show this — it is the CVE blind spot; some scanners flag unsupported versions of common products, but coverage varies and none give the date in advance. Organizations running EOL Mattermost should migrate immediately or implement compensating controls.