CVE-2025-12689 DoS in Calls plugin via malformed UTF-8 in WebSocket request

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...

PT-2025-51826

Name of the Vulnerable Software and Affected Versions Mattermost versions 11.0.0 through 11.0.4 Mattermost versions 10.11.0 through 10.11.6 Mattermost versions 10.12.0 through 10.12.2 Mattermost Calls versions 1.10.0 and earlier Description The software does not properly implement Cross-Site...