{"id":"CVE-2026-71424","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-71424","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…","details":"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_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.","published":"2026-08-17T22:17:26.527","modified":"2026-08-17T22:17:26.527","cvss":{"score":9.6,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/onyx-dot-app/onyx/commit/3f3d79d1a7722fdc84a1c61c8aa830d890017e9e","label":"onyx-dot-app/onyx@3f3d79d"},"references":[{"type":"WEB","url":"https://github.com/onyx-dot-app/onyx/commit/3f3d79d1a7722fdc84a1c61c8aa830d890017e9e"},{"type":"WEB","url":"https://github.com/onyx-dot-app/onyx/commit/4001cedd0a8968723bfe95dd188914ed56777910"},{"type":"WEB","url":"https://github.com/onyx-dot-app/onyx/commit/b103937888fd5008067c2bb6eb6e5424576394f2"},{"type":"WEB","url":"https://github.com/onyx-dot-app/onyx/pull/11238"},{"type":"WEB","url":"https://github.com/onyx-dot-app/onyx/pull/11242"},{"type":"WEB","url":"https://github.com/onyx-dot-app/onyx/pull/11243"},{"type":"WEB","url":"https://github.com/onyx-dot-app/onyx/releases/tag/v4.0.0"},{"type":"WEB","url":"https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-q62f-rv3h-f822"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-17T22:17:26.527"}}