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CVE-2026-42276

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CVE-2026-42276

Published: May 8, 2026

Modified: May 8, 2026

PUBLISHED

CVSS v3.1

4.3

MEDIUM

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.

VendorProductVersions

onyx-dot-app

onyx

affected
< 3.0.9
affected
>= 3.1.0, < 3.1.6
affected
>= 3.2.0, < 3.2.6

Weaknesses (CWE)

CWE-639

CVSS v3.1 Details

CVSS v3.1 Vector

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

References

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