CVE-2026-1629

MEDIUM 4.3CVE-2026-1629 · Published 16/03/2026 · updated 17/06/2026

In short

CVE-2026-1629 is a MEDIUM (CVSS 4.3) vulnerability affecting mattermost server (mattermost).
Chance of exploitation in the next 30 days (EPSS): 0.23%, higher than 14.1% of all vulnerabilities.
Fix: update to 10.11.11 or later.

Package	Affected versions	Patched versions
mattermost server mattermost	`≥ 10.11.0, < 10.11.11`	`10.11.11`

Description

Mattermost versions 10.11.x <= 10.11.10 Fail to invalidate cached permalink preview data when a user loses channel access which allows the user to continue viewing private channel content via previously cached permalink previews until cache reset or relogin.. Mattermost Advisory ID: MMSA-2026-00580

References

mattermost.com/security-updates · Vendor Advisory

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Package

Affected versions

Patched versions

mattermost server

mattermost

≥ 10.11.0, < 10.11.11

10.11.11

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