CVE-2026-85700

Onyx 4.6.6 fails to properly restrict access to custom tool credentials stored in custom_headers, allowing any authenticated user to read admin-defined API keys. Attackers with basic authentication can call GET /tool/{tool_id} or GET /tool endpoints to retrieve plaintext authorization headers and third-party API credentials, then use them to directly access upstream APIs.

  • Published Sep 4, 2026
  • CVSS 7.1 high
  • 0.5% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-85700 at the National Vulnerability Database