VULNERABILITY INTELLIGENCE

CVE-2025-12689

CVSS score6.5 MEDIUM
EPSS probability0.29%
CISA KEVNot currently listed
Published2025-12-17
Last modified2026-10-13
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Description

Mattermost versions 11.0.x <= 11.0.4, 10.12.x <= 10.12.2, 10.11.x <= 10.11.6 fail to check WebSocket request field for proper UTF-8 format, which allows attacker to crash Calls plug-in via sending malformed request.

Weakness classification

  • CWE-1287: Improper Validation of Specified Type of Input

Primary references