Medium 4.3Published Sep 24, 2026

CVE-2026-77321TREK MCP trip summary bypasses delegated OAuth read scopes

Updated under an hour ago (2026-10-19 08:40 UTC)

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It affects mauriceboe TREK. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for mauriceboe TREK

Exploited in the last 30 days

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: 4.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-200, CWE-284, CWE-862
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Oct 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

mauriceboe TREK mauriceboe:trek (from the name)	before 3.3.0	CNA record

References

https://github.com/liketrek/TREK/security/advisories/GHSA-qvw8-w937-vcmqx-refsource-confirm
https://github.com/liketrek/TREK/pull/1520x-refsource-misc
https://github.com/liketrek/TREK/commit/19064b39176660f3be3a2df198c87949504046e2x-refsource-misc
https://github.com/liketrek/TREK/releases/tag/v3.3.0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.