Is CVE-2026-42276 actively exploited?

No active exploitation of CVE-2026-42276 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42276 be exploited remotely?

Yes. CVE-2026-42276 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42276?

CVE-2026-42276 has a CVSS score of 4.3 (MEDIUM).

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MEDIUM

CVE-2026-42276

CWE-639Published: May 8, 2026· Updated: May 12, 2026

4.3

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:14.0th

Official 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.

NVD Source

Technical Analysis

CVE-2026-42276 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.