---
cve: "CVE-2026-77321"
severity: "MEDIUM"
cvss: 4.3
epss: "2.2%"
vendor: "mauriceboe"
kev: false
exploited: false
published: "2026-09-24 19:17:16"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-25T01:23:58+02:00"
---

# CVE-2026-77321

> 4.3 MEDIUM · 🧪 PoC

## Beschreibung

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-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Keine | good |
| A Verfügbarkeit | Keine | good |

## Referenzen

- <https://github.com/liketrek/TREK/security/advisories/GHSA-qvw8-w937-vcmq>
- <https://github.com/liketrek/TREK/pull/1520>
- <https://github.com/liketrek/TREK/commit/19064b39176660f3be3a2df198c87949504046e2>
- <https://github.com/liketrek/TREK/releases/tag/v3.3.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-77321) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_