{"id":"CVE-2026-71424","state":"PUBLISHED","title":"Onyx: Cross-user OAuth-token leak via /api/mcp/servers* for per-user MCP servers","description":"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.","publishedAt":"2026-08-17T21:28:32.814Z","updatedAt":"2026-08-18T17:47:10.013Z","severity":{"score":9.6,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["onyx-dot-app onyx"],"affected":[{"vendor":"onyx-dot-app","product":"onyx","versions":[{"version":"< 3.1.10","status":"affected"},{"version":">= 3.2.0, < 3.2.14","status":"affected"},{"version":">= 3.3.0-beta.0, < 4.0.0","status":"affected"}]}],"references":["https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-q62f-rv3h-f822","https://github.com/onyx-dot-app/onyx/pull/11238","https://github.com/onyx-dot-app/onyx/pull/11242","https://github.com/onyx-dot-app/onyx/pull/11243","https://github.com/onyx-dot-app/onyx/commit/3f3d79d1a7722fdc84a1c61c8aa830d890017e9e","https://github.com/onyx-dot-app/onyx/commit/4001cedd0a8968723bfe95dd188914ed56777910","https://github.com/onyx-dot-app/onyx/commit/b103937888fd5008067c2bb6eb6e5424576394f2","https://github.com/onyx-dot-app/onyx/releases/tag/v4.0.0"],"weaknesses":["CWE-200","CWE-863"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/71xxx/CVE-2026-71424.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-71424","state":"PUBLISHED","datePublished":"2026-08-17T21:28:32.814Z","dateUpdated":"2026-08-18T17:47:10.013Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-06T16:28:51.182Z"},"containers":{"cna":{"title":"Onyx: Cross-user OAuth-token leak via /api/mcp/servers* for per-user MCP servers","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"onyx-dot-app","product":"onyx","versions":[{"version":"< 3.1.10","status":"affected"},{"version":">= 3.2.0, < 3.2.14","status":"affected"},{"version":">= 3.3.0-beta.0, < 4.0.0","status":"affected"}]}],"references":[{"url":"https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-q62f-rv3h-f822","name":"https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-q62f-rv3h-f822","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/onyx-dot-app/onyx/pull/11238","name":"https://github.com/onyx-dot-app/onyx/pull/11238","tags":["x_refsource_MISC"]},{"url":"https://github.com/onyx-dot-app/onyx/pull/11242","name":"https://github.com/onyx-dot-app/onyx/pull/11242","tags":["x_refsource_MISC"]},{"url":"https://github.com/onyx-dot-app/onyx/pull/11243","name":"https://github.com/onyx-dot-app/onyx/pull/11243","tags":["x_refsource_MISC"]},{"url":"https://github.com/onyx-dot-app/onyx/commit/3f3d79d1a7722fdc84a1c61c8aa830d890017e9e","name":"https://github.com/onyx-dot-app/onyx/commit/3f3d79d1a7722fdc84a1c61c8aa830d890017e9e","tags":["x_refsource_MISC"]},{"url":"https://github.com/onyx-dot-app/onyx/commit/4001cedd0a8968723bfe95dd188914ed56777910","name":"https://github.com/onyx-dot-app/onyx/commit/4001cedd0a8968723bfe95dd188914ed56777910","tags":["x_refsource_MISC"]},{"url":"https://github.com/onyx-dot-app/onyx/commit/b103937888fd5008067c2bb6eb6e5424576394f2","name":"https://github.com/onyx-dot-app/onyx/commit/b103937888fd5008067c2bb6eb6e5424576394f2","tags":["x_refsource_MISC"]},{"url":"https://github.com/onyx-dot-app/onyx/releases/tag/v4.0.0","name":"https://github.com/onyx-dot-app/onyx/releases/tag/v4.0.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.6,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-200","lang":"en","description":"CWE-200: Exposure of Sensitive Information to an Unauthorized Actor","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-863","lang":"en","description":"CWE-863: Incorrect Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-17T21:28:32.814Z"},"source":{"advisory":"GHSA-q62f-rv3h-f822","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-18T17:28:35.060950Z","id":"CVE-2026-71424","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-18T17:47:10.013Z"}}]}}}