CVE-2026-42276

Description

Onyx is an open-source AI platform. Prior to versions 3.0.9, 3.1.6, and 3.2.6, the POST /chat/stop-chat-session/{chat_session_id} endpoint lets any authenticated user stop any other user's active chat session. The endpoint checks authentication but never verifies the session belongs to the caller. An attacker who knows a chat session UUID can kill another user's LLM generation mid-stream. This issue has been patched in versions 3.0.9, 3.1.6, and 3.2.6.

CVSS Vector

References

• https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-rw6w-hp62-gc8w
• https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-rw6w-hp62-gc8w