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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.

PUBLISHED Reserved 2026-04-26 | Published 2026-05-08 | Updated 2026-05-08 | Assigner GitHub_M




MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Problem types

CWE-639: Authorization Bypass Through User-Controlled Key

Product status

< 3.0.9
affected

>= 3.1.0, < 3.1.6
affected

>= 3.2.0, < 3.2.6
affected

References

github.com/...p/onyx/security/advisories/GHSA-rw6w-hp62-gc8w exploit

github.com/...p/onyx/security/advisories/GHSA-rw6w-hp62-gc8w

cve.org (CVE-2026-42276)

nvd.nist.gov (CVE-2026-42276)

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