CVE-2026-3637

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to check the create_post channel permission during post edit operations which allows an authenticated attacker with revoked posting privileges to modify their existing posts via direct API requests to the post update and patch endpoints.. Mattermost Advisory ID: MMSA-2026-00627

Score
CVSS 3.1 4.3 Medium
Status
Analyzed - responsibledisclosure@mattermost.com
Published
2026-05-18
Last modified
2026-10-14
Weaknesses
CWE-862

Affected products

References

 
 
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