CVE-2026-42277 MEDIUM

CVE-2026-42277: Onyx: IDOR in /chat/file/{file_id} allows any authenticated user to download other users files

Vendor Onyx-Dot-App
Product onyx
Weakness CWE-639 · IDOR
Published May 8, 2026
Last update May 8, 2026

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 8, 2026 CVE published
May 8, 2026 Record updated