{"id":"CVE-2026-77321","summary":"TREK MCP trip summary bypasses delegated OAuth read scopes","details":"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.","aliases":["GHSA-qvw8-w937-vcmq"],"modified":"2026-09-27T03:30:27.740781765Z","published":"2026-09-24T18:04:05.947Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77321.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-200","CWE-284","CWE-862"]},"references":[{"type":"WEB","url":"https://github.com/liketrek/TREK/releases/tag/v3.3.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77321.json"},{"type":"ADVISORY","url":"https://github.com/liketrek/TREK/security/advisories/GHSA-qvw8-w937-vcmq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77321"},{"type":"FIX","url":"https://github.com/liketrek/TREK/commit/19064b39176660f3be3a2df198c87949504046e2"},{"type":"FIX","url":"https://github.com/liketrek/TREK/pull/1520"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/liketrek/trek","events":[{"introduced":"0"},{"fixed":"19064b39176660f3be3a2df198c87949504046e2"},{"fixed":"f9c992ec9363301762ac00e97747c1dd0fe37d6b"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"3.3.0"}]}}],"versions":["plugin-sdk-v1.3.1","v3.2.1","plugin-sdk-v1.3.0","v3.2.0","v3.1.4","v3.1.3","v3.1.2","v3.1.1","v3.1.0","v3.0.22","v3.0.21","v3.0.20","v3.0.19","v3.0.18","v3.0.17","v3.0.16","v3.0.15","v3.0.14","v3.0.13","v3.0.12","v3.0.11","v3.0.10","v3.0.9","v3.0.8","v3.0.7","v3.0.6","v3.0.5","v3.0.4","v3.0.3","v3.0.2","v3.0.1","v3.0.0","v2.9.14","v2.9.13","v2.9.12","v2.9.11","v2.9.10","v2.9.9","v2.9.8","v2.9.7","v2.9.6","v2.9.5","v2.9.4","v2.9.2","v2.8.4","v2.8.0","v2.7.2","v2.7.0","v2.6.2","v2.6.1","v2.6.0","v2.5.7","v2.5.6","v2.5.5","v2.5.4","v2.5.2","v2.5.1","v2.5.0","v2.4.0","v2.3.5","v2.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77321.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"}]}