CVE-2026-77321

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 v3 4.3 MEDIUM

4.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
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

Configurations

No configuration.

History

24 Sep 2026, 19:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-24 19:17

Updated : 2026-10-05 16:17

NVD link : CVE-2026-77321

Mitre link : CVE-2026-77321

CVE.ORG link : CVE-2026-77321

JSON object : View

Products Affected

No product.

CWE

CWE-200

Exposure of Sensitive Information to an Unauthorized Actor

CWE-284

Improper Access Control

CWE-862

Missing Authorization

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