Is CVE-2026-42277 actively exploited?

No active exploitation of CVE-2026-42277 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42277 be exploited remotely?

Yes. CVE-2026-42277 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42277?

CVE-2026-42277 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2026-42277

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

6.5

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.1th

Official Description

Onyx is an open-source AI platform. Prior to versions 3.0.9, 3.1.6, and 3.2.6, the GET /chat/file/{file_id} endpoint allows any authenticated user to download any other user's uploaded files by providing the file UUID. The endpoint verifies the caller is authenticated but never checks that the file belongs to them. An attacker who knows or obtains a file UUID can access confidential documents, chat attachments, and other files uploaded by any user in the system. This issue has been patched in versions 3.0.9, 3.1.6, and 3.2.6.

NVD Source

Technical Analysis

CVE-2026-42277 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.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 6.5.