PT-2026-33037 · Mattermost · Mattermost

Eva Sarafianou · Published 2026-04-15 · Updated 2026-04-15 · CVE-2026-28741

NVD

CVSS v3.1

6.8

Medium

AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Mattermost versions 10.11.x <= 10.11.12, 11.5.x <= 11.5.0, 11.4.x <= 11.4.2, 11.3.x <= 11.3.2 fail to validate CSRF tokens on an authentication endpoint which allows an attacker to update a user's authentication method via a CSRF attack by tricking a user into visiting a malicious page. Mattermost Advisory ID: MMSA-2026-00625

Fix

CSRF

Weakness Enumeration

CWE-352

Related Identifiers

CVE-2026-28741

Affected Products

Mattermost

References · 2

• https://mattermost.com/security-updates · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-28741 · Security Note