Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/liketrek/TREK/commit/19064b39176660f3be3a2df198c87949504046e2
- https://github.com/liketrek/TREK/pull/1520
- https://github.com/liketrek/TREK/releases/tag/v3.3.0
- https://github.com/liketrek/TREK/security/advisories/GHSA-qvw8-w937-vcmq
FAQ
What is CVE-2026-77321?
CVE-2026-77321 is a vulnerability with a CVSS score of 4.3 (MEDIUM). 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 co...
How severe is CVE-2026-77321?
CVE-2026-77321 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-77321?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.