CVE-2026-27659 MEDIUM

CVE-2026-27659: CSRF vulnerability in UpdateAccessControlPolicyActiveStatus endpoint

Vendor Mattermost
Product Mattermost
Weakness CWE-352 · CSRF
Published March 25, 2026
Last update March 25, 2026
View on NVD All CVEs

CVSS base score

4.6/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

March 25, 2026 CVE published
March 25, 2026 Record updated