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mattermost/mattermost · Security

Mattermost doesn't properly validate CSRF tokens

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GHSA ID
GHSA-rmhw-c3xr-m3xx
CVE ID
CVE-2026-27659
Severity
medium
Published
Updated
CVSS
4.6 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
CVSS v3
4.6 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

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

CWEs

  • CWE-352 · Cross-Site Request Forgery (CSRF)

References