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Vulnerability · Published Feb 16, 2026 · Assigned by Mattermost

CVE-2025-13821User profile update exposes password hash and MFA secrets

Medium 5.7

In plain English

A medium-severity information exposure in Mattermost from Mattermost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.7Medium
Exploit odds (30 days)0.2%top 85.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/mattermost/mattermost-serverno fix listedGO-2026-4524
Gogithub.com/mattermost/mattermost-serverno fix listedGHSA-pp9j-pf5c-659x
Gogithub.com/mattermost/mattermost-serverno fix listedGHSA-pp9j-pf5c-659x
Gogithub.com/mattermost/mattermost-serverno fix listedGHSA-pp9j-pf5c-659x
Gogithub.com/mattermost/mattermost-server5.3.2-0.20251210191531-cd17b61de41bGHSA-pp9j-pf5c-659x
Gogithub.com/mattermost/mattermost-serverno fix listedGO-2026-4524
Gogithub.com/mattermost/mattermost-serverno fix listedGO-2026-4524
Gogithub.com/mattermost/mattermost-serverno fix listedGO-2026-4524
Gogithub.com/mattermost/mattermost-server/v5no fix listedGO-2026-4524
Gogithub.com/mattermost/mattermost-server/v6no fix listedGO-2026-4524
Gogithub.com/mattermost/mattermost/server/v88.0.0-20251210191531-cd17b61de41bGO-2026-4524
Gogithub.com/mattermost/mattermost/server/v88.0.0-20251210191531-cd17b61de41bGHSA-pp9j-pf5c-659x

Affected products (as reported)

VendorProductVersions
Mattermost Mattermost 11.1.0 – through 11.1.210.11.0 – through 10.11.911.2.0 – through 11.2.1

Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

References