CVE-2026-42276
Last modified
CVE-2026-42276 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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. EPSS estimates a 0.28% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Onyx | Onyx | < 3.0.9 |
| Onyx | Onyx | >= 3.1.0, < 3.1.6 |
| Onyx | Onyx | >= 3.2.0, < 3.2.6 |
References
- https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-rw6w-hp62-gc8wExploit, Vendor Advisory
- https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-rw6w-hp62-gc8wExploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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