CVE-2025-31363: Mattermost versions 10.4.x <= 10.4.2, 10.5.x <= 10.5.0, 9.11.x <= 9.11.9 fail to restrict domains the LLM can request to

Mattermost (a team communication platform) versions 10.4.2 and earlier, 10.5.0 and earlier, and 9.11.9 and earlier don't properly block which websites their built-in AI tool can contact. This allows logged-in users to use prompt injection (tricking the AI by hiding instructions in their input) to steal data from servers that the Mattermost system can access.