Security Advisory

CVE-2026-27659

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-03-25 16:33:32

Last updated 2026-03-25 17:39:28

Assigner Mattermost

State PUBLISHED

Description

Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to properly validate CSRF tokens in the /api/v4/access_control_policies/{policy_id}/activate endpoint, which allows an attacker to trick an admin into changing access control policy active status via a crafted request.. Mattermost Advisory ID: MMSA-2026-00578

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