CVE-2026-42276
Published:May 08, 2026
Updated:May 16, 2026
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.
Affected Packages
https://github.com/onyx-dot-app/onyx.git (GITHUB):
Affected version(s) >=v0.0.1-testing <v3.0.9Fix Suggestion:
Update to version v3.0.9https://github.com/onyx-dot-app/onyx.git (GITHUB):
Affected version(s) >=v3.1.0 <v3.1.6Fix Suggestion:
Update to version v3.1.6https://github.com/onyx-dot-app/onyx.git (GITHUB):
Affected version(s) >=v3.2.0 <v3.2.6Fix Suggestion:
Update to version v3.2.6Related Resources (1)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Authorization Bypass Through User-Controlled Key
EPSS
Base Score:
0.05