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mattermost/mattermost · Security

Mattermost doesn't validate CSRF tokens on an authentication endpoint

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GHSA ID
GHSA-m7cf-4gh2-v4qg
CVE ID
CVE-2026-28741
Severity
medium
Published
Updated
CVSS
6.8 · CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
CVSS v3
6.8 · CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Description

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.

CWEs

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

References