GHSA-m7cf-4gh2-v4qgMediumCVSS 6.8

Mattermost doesn't validate CSRF tokens on an authentication endpoint

Published
April 17, 2026
Last Modified
April 29, 2026

🔗 CVE IDs covered (1)

CVE-2026-28741 →

📋 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.

🎯 Affected products4

  • go/github.com/mattermost/mattermost/server/v8:>= 8.0.0-20250721062209-4952acea88ce, < 8.0.0-20260220133927-c29cf05d40f8
  • go/github.com/mattermost/mattermost/server/v8:= 11.5.0-rc1
  • go/github.com/mattermost/mattermost/server/v8:>= 11.4.0-rc1, < 11.4.3
  • go/github.com/mattermost/mattermost/server/v8:>= 11.3.0-rc1, < 11.3.3

🔗 References (3)