{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-71424","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-08-06T16:28:51.182Z","datePublished":"2026-08-17T21:28:32.814Z","dateUpdated":"2026-08-18T17:47:10.013Z"},"containers":{"cna":{"title":"Onyx: Cross-user OAuth-token leak via /api/mcp/servers* for per-user MCP servers","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"}]}],"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"}}],"references":[{"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/security/advisories/GHSA-q62f-rv3h-f822"},{"name":"https://github.com/onyx-dot-app/onyx/pull/11238","tags":["x_refsource_MISC"],"url":"https://github.com/onyx-dot-app/onyx/pull/11238"},{"name":"https://github.com/onyx-dot-app/onyx/pull/11242","tags":["x_refsource_MISC"],"url":"https://github.com/onyx-dot-app/onyx/pull/11242"},{"name":"https://github.com/onyx-dot-app/onyx/pull/11243","tags":["x_refsource_MISC"],"url":"https://github.com/onyx-dot-app/onyx/pull/11243"},{"name":"https://github.com/onyx-dot-app/onyx/commit/3f3d79d1a7722fdc84a1c61c8aa830d890017e9e","tags":["x_refsource_MISC"],"url":"https://github.com/onyx-dot-app/onyx/commit/3f3d79d1a7722fdc84a1c61c8aa830d890017e9e"},{"name":"https://github.com/onyx-dot-app/onyx/commit/4001cedd0a8968723bfe95dd188914ed56777910","tags":["x_refsource_MISC"],"url":"https://github.com/onyx-dot-app/onyx/commit/4001cedd0a8968723bfe95dd188914ed56777910"},{"name":"https://github.com/onyx-dot-app/onyx/commit/b103937888fd5008067c2bb6eb6e5424576394f2","tags":["x_refsource_MISC"],"url":"https://github.com/onyx-dot-app/onyx/commit/b103937888fd5008067c2bb6eb6e5424576394f2"},{"name":"https://github.com/onyx-dot-app/onyx/releases/tag/v4.0.0","tags":["x_refsource_MISC"],"url":"https://github.com/onyx-dot-app/onyx/releases/tag/v4.0.0"}],"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"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-08-17T21:28:32.814Z"},"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."}],"source":{"advisory":"GHSA-q62f-rv3h-f822","discovery":"UNKNOWN"}},"adp":[{"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"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-18T17:47:10.013Z"}}]}}