{"id":"CVE-2026-85700","title":"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","summary":"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 /to…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-522"],"published":"2026-09-04","updated":"2026-09-23","sourceUpdated":"2026-09-23T17:17:45.033","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-85700","references":[{"url":"https://github.com/onyx-dot-app/onyx","label":"disclosure@vulncheck.com"},{"url":"https://github.com/onyx-dot-app/onyx/blob/v4.6.6/backend/onyx/server/features/tool/api.py","label":"disclosure@vulncheck.com"},{"url":"https://github.com/onyx-dot-app/onyx/blob/v4.6.6/backend/onyx/server/features/tool/models.py","label":"disclosure@vulncheck.com"},{"url":"https://github.com/onyx-dot-app/onyx/issues/13165","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/onyx-4.6.6-custom-tool-secret-header-disclosure-via-tool-endpoints","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.0029,"epssPercentile":0.21786,"ingestedAt":"2026-09-23T17:28:14.826Z","slug":"CVE-2026-85700","body":"## Overview\n\nOnyx 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}