CVE-2025-31363

Summary

CVE-2025-31363 is a vulnerability affecting Mattermost versions 10.4.x up to 10.4.2, 10.5.x up to 10.5.0, and 9.11.x up to 9.11.9. This issue allows authenticated users to exfiltrate data from arbitrary servers, which are accessible to the victim. The flaw stems from a failure to restrict domains that the Language Model Module (LLM) can contact upstream, enabling prompt injection in the AI plugin's Jira tool. This vulnerability could potentially lead to significant data leaks. Users are strongly encouraged to update their Mattermost installations as soon as possible to mitigate this risk.

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