CVE-2025-31363: Mattermost doesn't restrict domains LLM can request to contact upstream

April 16, 2025 (updated April 23, 2025)

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 contact upstream which allows an authenticated user to exfiltrate data from an arbitrary server accessible to the victim via performing a prompt injection in the AI plugin’s Jira tool.

References

github.com/advisories/GHSA-9h6j-4ffx-cm84
github.com/mattermost/mattermost
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2025-31363
pkg.go.dev/vuln/GO-2025-3622

Code Behaviors & Features

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