CVE-2026-42277 — Onyx is an open-source AI platform. Prior to versions

title: CVE-2026-42277 - Onyx AI Platform Unauthorized File Download
id: scw-2026-05-08-ai-1
status: experimental
level: high
description: |
  Detects unauthorized access to files in the Onyx AI platform by identifying GET requests to the /chat/file/{file_id} endpoint that return a successful status code. This specific path and method are indicative of an attempt to exploit CVE-2026-42277, where authenticated users can download any file by providing its UUID without proper ownership verification.
author: SCW Feed Engine (AI-generated)
date: 2026-05-08
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-42277/
tags:
  - attack.credential_access
  - attack.t1110.001
logsource:
    category: webserver
detection:
  selection:
      cs-method:
          - 'GET'
      cs-uri|startswith:
          - '/chat/file/'
      sc-status:
          - 200
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse