Mattermost fails to check Websocket request for proper UTF-8 format potentially crashing Calls plug-in

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-2025-51852

Name of the Vulnerable Software and Affected Versions Mattermost versions 11.0.x through 11.0.4 Mattermost versions 10.11.x through 10.11.6 Mattermost versions 10.12.x through 10.12.2 Description The software does not properly validate the UTF-8 format of WebSocket requests. This allows an attack...