Moole Vulnerability Database

Find real vulnerabilities before they ship

Medium

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 allows authenticated users to exfiltrate password hashes and MFA secrets via profile nickname updates or email verification events. Mattermost Advisory ID: MMSA-2025-00560

VectorNETWORK

PublishedFeb 16, 2026, 12:16

Published Byresponsibledisclosure@mattermost.com

Base Score

Score5.7

Affected Versions

Package (Ecosystem)IntroducedFixedLimit

github.com/mattermost/mattermost/server/v8(Go)08.0.0-20251210191531-cd17b61de41bN/A

github.com/mattermost/mattermost-server(Go)11.1.0N/AN/A

github.com/mattermost/mattermost-server(Go)10.11.0N/AN/A

github.com/mattermost/mattermost-server(Go)11.2.0N/AN/A

github.com/mattermost/mattermost-server(Go)05.3.2-0.20251210191531-cd17b61de41bN/A

References

https://mattermost.com/security-updates

Weakness Type

NVD-CWE-noinfo

CVSS Metrics

Base Score

5.7

Vector String

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Base SeverityMedium

Version

3.1

Attack Vector (AV)

NETWORK