CVE-2025-13821 PUBLISHED

User profile update exposes password hash and MFA secrets

Assigner: Mattermost
Reserved: 01.12.2025 Published: 16.02.2026 Updated: 16.02.2026

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

Metrics

CVSS 3.1

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

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	None
User Interaction	Required	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Mattermost
Product	Mattermost
Versions	Default: unaffected affected from 11.1.0 to 11.1.2 (incl.) affected from 10.11.0 to 10.11.9 (incl.) affected from 11.2.0 to 11.2.1 (incl.) Version 11.3.0 is unaffected Version 11.1.3 is unaffected Version 10.11.10 is unaffected Version 11.2.2 is unaffected

Solutions

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

Credits

daw10 finder

References

MMSA-2025-00560

Problem Types

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