GitHub Advisoryadvisory · Go

GHSA-pp9j-pf5c-659x Mattermost fails to sanitize sensitive data in WebSocket messages

MEDIUM Published 2026-02-16 Modified 2026-02-19 Official page ↗
Aliases
CVE-2025-13821
Ecosystem
Go
Packages
github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost-server
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Weaknesses
CWE-200
Reviewed
2026-02-19

Affected packages

• Go github.com/mattermost/mattermost/server/v8: < 8.0.0-20251210191531-cd17b61de41b → fixed in 8.0.0-20251210191531-cd17b61de41b • Go github.com/mattermost/mattermost-server: < 11.1.3 (no fix yet) • Go github.com/mattermost/mattermost-server: < 10.11.10 (no fix yet) • Go github.com/mattermost/mattermost-server: < 11.2.2 (no fix yet) • Go github.com/mattermost/mattermost-server: < 5.3.2-0.20251210191531-cd17b61de41b → fixed in 5.3.2-0.20251210191531-cd17b61de41b

Description

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to sanitize sensitive data in WebSocket messages which allows authenticated users to exfiltrate password hashes and MFA secrets via profile nickname updates or email verification events. Mattermost Advisory ID: MMSA-2025-00560

Related

Alias · CVE (1)

  • CVE-2025-13821 Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to sanitize sensitive data in WebSocket messages which… vulnerability

Weakness · CWE (1)

  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor weakness

References