CVE-2025-13821

User profile update exposes password hash and MFA secrets

Published Feb 16, 2026 CVSS 3.1 · 5.7 Medium EPSS < 1% KEV · Not listed
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

Remediation

Vendor Solution

Update Mattermost to versions 11.3.0, 11.1.3, 10.11.10, 11.2.2 or higher.

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-pp9j-pf5c-659x Mattermost fails to sanitize sensitive data in WebSocket messages
References
History
Type Values Removed Values Added
First Time appeared Mattermost mattermost Server
Weaknesses NVD-CWE-noinfo
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Vendors & Products Mattermost mattermost Server
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost
Vendors & Products Mattermost
Mattermost mattermost
Type Values Removed Values Added
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
Title User profile update exposes password hash and MFA secrets
Weaknesses CWE-200
References
Metrics cvssV3_1

{'score': 5.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Feb 17, 2026, 5:06 PM
Reserved
Dec 1, 2025, 11:24 AM
Status
Analyzed
Published
Feb 16, 2026, 12:16 PM
Modified
Jun 17, 2026, 8:34 AM