{"id":"CVE-2026-77321","state":"PUBLISHED","title":"TREK MCP trip summary bypasses delegated OAuth read scopes","description":"TREK is a collaborative travel planner. Prior to 3.3.0, the get_trip_summary tool in server/src/mcp/tools/trips.ts is registered for scoped OAuth MCP tokens without requiring trips:read and returns core trip summary data regardless of the delegated scopes. A token granted only an unrelated capability, such as weather:read, can receive trip metadata, member email addresses from server/src/services/tripService.ts, itinerary days, and accommodations for every trip accessible to the token's user. Cross-user trip authorization remains enforced, but the missing scope check defeats the consented least-privilege boundary and exposes trip content and third-party contact information to an MCP client that was not authorized to read it. This issue is fixed in version 3.3.0.","publishedAt":"2026-09-24T18:04:05.947Z","updatedAt":"2026-10-05T15:32:36.028Z","severity":{"score":4.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["mauriceboe TREK"],"affected":[{"vendor":"mauriceboe","product":"TREK","versions":[{"version":"< 3.3.0","status":"affected"}]}],"references":["https://github.com/liketrek/TREK/security/advisories/GHSA-qvw8-w937-vcmq","https://github.com/liketrek/TREK/pull/1520","https://github.com/liketrek/TREK/commit/19064b39176660f3be3a2df198c87949504046e2","https://github.com/liketrek/TREK/releases/tag/v3.3.0"],"weaknesses":["CWE-200","CWE-284","CWE-862"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/77xxx/CVE-2026-77321.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-77321","state":"PUBLISHED","datePublished":"2026-09-24T18:04:05.947Z","dateUpdated":"2026-10-05T15:32:36.028Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-20T19:24:11.617Z"},"containers":{"cna":{"title":"TREK MCP trip summary bypasses delegated OAuth read scopes","descriptions":[{"lang":"en","value":"TREK is a collaborative travel planner. Prior to 3.3.0, the get_trip_summary tool in server/src/mcp/tools/trips.ts is registered for scoped OAuth MCP tokens without requiring trips:read and returns core trip summary data regardless of the delegated scopes. A token granted only an unrelated capability, such as weather:read, can receive trip metadata, member email addresses from server/src/services/tripService.ts, itinerary days, and accommodations for every trip accessible to the token's user. Cross-user trip authorization remains enforced, but the missing scope check defeats the consented least-privilege boundary and exposes trip content and third-party contact information to an MCP client that was not authorized to read it. This issue is fixed in version 3.3.0."}],"affected":[{"vendor":"mauriceboe","product":"TREK","versions":[{"version":"< 3.3.0","status":"affected"}]}],"references":[{"url":"https://github.com/liketrek/TREK/security/advisories/GHSA-qvw8-w937-vcmq","name":"https://github.com/liketrek/TREK/security/advisories/GHSA-qvw8-w937-vcmq","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/liketrek/TREK/pull/1520","name":"https://github.com/liketrek/TREK/pull/1520","tags":["x_refsource_MISC"]},{"url":"https://github.com/liketrek/TREK/commit/19064b39176660f3be3a2df198c87949504046e2","name":"https://github.com/liketrek/TREK/commit/19064b39176660f3be3a2df198c87949504046e2","tags":["x_refsource_MISC"]},{"url":"https://github.com/liketrek/TREK/releases/tag/v3.3.0","name":"https://github.com/liketrek/TREK/releases/tag/v3.3.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/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-284","lang":"en","description":"CWE-284: Improper Access Control","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-862","lang":"en","description":"CWE-862: Missing Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-24T18:04:05.947Z"},"source":{"advisory":"GHSA-qvw8-w937-vcmq","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-05T14:47:04.222887Z","id":"CVE-2026-77321","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-05T15:32:36.028Z"}}]}}}