GitHub Advisoryadvisory · Go

GHSA-m7cf-4gh2-v4qg Mattermost doesn't validate CSRF tokens on an authentication endpoint

MEDIUM Published 2026-04-17 Modified 2026-04-29 Official page ↗
Aliases
CVE-2026-28741
Ecosystem
Go
Packages
github.com/mattermost/mattermost/server/v8
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Weaknesses
CWE-352
Reviewed
2026-04-29

Affected packages

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

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.

Related

Alias · CVE (1)

  • CVE-2026-28741 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… vulnerability

Weakness · CWE (1)

  • CWE-352 Cross-Site Request Forgery weakness

References