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TI-2026-53967 Aliases CVE-2026-77321

TREK MCP trip summary bypasses delegated OAuth read scopes

Priority LOW 19CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure, Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-200 and CWE-284.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00199 9th percentileScored 2026-11-07
Fix Fixed TREK (mauriceboe): 3.3.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
mauriceboeTREKbefore 3.3.03.3.0Patch availableCNA
  • TREK Vendormauriceboe Affected before 3.3.0 Fixed in 3.3.0 Patch available CNA

Remediation

  • Fix · CNA TREK (mauriceboe) Fixed in 3.3.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-77321
  2. 2026-10-05 CISA SSVC decision points changed

References

Other 4

  • TI-2026-53961 TREK: Server-Side Request Forgery via User-Configurable LLM Base URL CVSS 3.1HIGH 8.1
  • TI-2026-53960 TREK: Cross-user note-file deletion (IDOR / Broken Access Control) CVSS 3.1HIGH 7.1
  • TI-2026-53966 Information disclosure in mauriceboe TREK CVSS 3.1MEDIUM 5.3
  • TI-2026-33199 Time-based user enumeration in TREK authentication endpoint CVSS 3.1MEDIUM 5.3
  • TI-2026-39355 TREK IDOR: any authenticated user can read another user's journey share token (full journey leak) CVSS 3.1MEDIUM 6.5
  • TI-2026-39351 TREK: Stored cross-user HTML injection via trip title in the Journey suggestion banner CVSS 4.0LOW 2.0
See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences