CVE-2025-13821

User profile update exposes password hash and MFA secrets

State: Published
Severity: 5.7 Medium
Published: Feb 16, 2026
Updated: Feb 17, 2026
Reserved: Dec 1, 2025

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

Scores

CVSS	Score	Vector	Source
3.1	5.7 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N	Mattermost

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

Affected Products

Product	Versions
MattermostMattermost	11.1.0 through 11.1.2Affected 10.11.0 through 10.11.9Affected 11.2.0 through 11.2.1Affected 11.3.0Not affected 11.1.3Not affected 10.11.10Not affected 11.2.2Not affected

References

MMSA-2025-00560vendor-advisory

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