CVE-2026-27659

CSRF vulnerability in UpdateAccessControlPolicyActiveStatus endpoint

State: Published
Severity: 4.6 Medium
Published: Mar 25, 2026
Updated: Mar 25, 2026
Reserved: Feb 23, 2026

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

Scores

CVSS	Score	Vector	Source
3.1	4.6 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N	Mattermost

Weaknesses

CWE-352 Cross-Site Request Forgery (CSRF)

Affected Products

Product	Versions
MattermostMattermost	11.2.0 through 11.2.2Affected 10.11.0 through 10.11.10Affected 11.4.0 through 11.4.0Affected 11.3.0 through 11.3.1Affected 11.5.0Not affected 11.2.3Not affected 10.11.11Not affected 11.4.1Not affected 11.3.2Not affected

References

MMSA-2026-00578vendor-advisory

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