CVE-2026-42276
Onyx: IDOR in /chat/stop-chat-session allows any authenticated user to interrupt other users chat sessions
CVSS Score
4.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-639 |
| Vendor | onyx-dot-app |
| Product | onyx |
| Published | May 8, 2026 |
| Last Updated | May 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
onyx-dot-app / onyx
< 3.0.9 >= 3.1.0, < 3.1.6 >= 3.2.0, < 3.2.6