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CVE-2025-12689

MEDIUM CVSS: 6.5 Published: 2025-12-17 Modified: 2026-06-17

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.

Affected Platforms

Mattermost Mattermost Server

Weakness Type

CWE-1287

References