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.
History

Fri, 08 May 2026 13:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 08 May 2026 05:00:00 +0000

Type Values Removed Values Added
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.
Title Onyx: IDOR in /chat/stop-chat-session allows any authenticated user to interrupt other users chat sessions
Weaknesses CWE-639
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-08T12:57:18.681Z

Reserved: 2026-04-26T11:53:27.708Z

Link: CVE-2026-42276

cve-icon Vulnrichment

Updated: 2026-05-08T12:57:15.220Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-08T05:16:10.557

Modified: 2026-05-08T16:02:14.343

Link: CVE-2026-42276

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-08T06:30:46Z