CVE-2026-77321 (GCVE-0-2026-77321)
Vulnerability from cvelistv5 – Published: 2026-09-24 18:04 – Updated: 2026-10-05 15:32
VLAI
EPSS
VEX
Title
TREK MCP trip summary bypasses delegated OAuth read scopes
Summary
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.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-05 14:47 UTC
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/liketrek/TREK/security/advisor… | x_refsource_CONFIRM |
| https://github.com/liketrek/TREK/pull/1520 | x_refsource_MISC |
| https://github.com/liketrek/TREK/commit/19064b391… | x_refsource_MISC |
| https://github.com/liketrek/TREK/releases/tag/v3.3.0 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| mauriceboe | TREK |
Affected:
< 3.3.0
|
guessed |
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