{"id":"CVE-2026-71424","title":"Onyx is an open-source AI platform","summary":"Onyx is an open-source AI platform. Prior to 3.1.10, 3.2.14, and 4.0.0, Onyx's GET /api/mcp/servers and GET /api/mcp/servers/persona/{persona_id} endpoints expose another user's OAuth Authorization header because OnyxTokenStorage.set_tok…","severity":"critical","cvss":9.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","cwe":["CWE-200","CWE-863"],"published":"2026-08-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T20:09:01.757","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-71424","references":[{"url":"https://github.com/onyx-dot-app/onyx/commit/3f3d79d1a7722fdc84a1c61c8aa830d890017e9e","label":"security-advisories@github.com"},{"url":"https://github.com/onyx-dot-app/onyx/commit/4001cedd0a8968723bfe95dd188914ed56777910","label":"security-advisories@github.com"},{"url":"https://github.com/onyx-dot-app/onyx/commit/b103937888fd5008067c2bb6eb6e5424576394f2","label":"security-advisories@github.com"},{"url":"https://github.com/onyx-dot-app/onyx/pull/11238","label":"security-advisories@github.com"},{"url":"https://github.com/onyx-dot-app/onyx/pull/11242","label":"security-advisories@github.com"},{"url":"https://github.com/onyx-dot-app/onyx/pull/11243","label":"security-advisories@github.com"},{"url":"https://github.com/onyx-dot-app/onyx/releases/tag/v4.0.0","label":"security-advisories@github.com"},{"url":"https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-q62f-rv3h-f822","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.00291,"epssPercentile":0.21917,"ingestedAt":"2026-09-18T20:51:25.625Z","slug":"CVE-2026-71424","body":"## Overview\n\nOnyx is an open-source AI platform. Prior to 3.1.10, 3.2.14, and 4.0.0, Onyx's GET /api/mcp/servers and GET /api/mcp/servers/persona/{persona_id} endpoints expose another user's OAuth Authorization header because OnyxTokenStorage.set_tokens and OnyxTokenStorage.set_client_info in backend/onyx/server/features/mcp/api.py copy per-user tokens into a shared admin MCPConnectionConfig row and _db_mcp_server_to_api_mcp_server returns that row through auth_template.headers to any BASIC_ACCESS user. This issue is fixed in versions 3.1.10, 3.2.14, and 4.0.0.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":52.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}