CVE-2026-27659

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CVSS 3.1

4.6 medium

EPSS

<1%p2

Published

Mar 25, 2026 (Mar 25, 2026)

Modified

Jun 17, 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

Vendors: mattermost
Products: mattermost server
Weakness: CWE-352
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (0.1%)

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