Security Advisory

CVE-2026-3637

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-05-18 06:53:29

Last updated 2026-05-18 14:35:00

Assigner Mattermost

CVSS score 4.3

State PUBLISHED

Description

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

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