{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "3.3.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "19064b39176660f3be3a2df198c87949504046e2"
            },
            {
              "fixed": "f9c992ec9363301762ac00e97747c1dd0fe37d6b"
            }
          ],
          "repo": "https://github.com/liketrek/trek",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-qvw8-w937-vcmq"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-200",
      "CWE-284",
      "CWE-862"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77321.json"
  },
  "details": "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.",
  "id": "CVE-2026-77321",
  "modified": "2026-09-27T03:30:27.740781765Z",
  "published": "2026-09-24T18:04:05.947Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/liketrek/TREK/releases/tag/v3.3.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77321.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/liketrek/TREK/security/advisories/GHSA-qvw8-w937-vcmq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-77321"
    },
    {
      "type": "FIX",
      "url": "https://github.com/liketrek/TREK/commit/19064b39176660f3be3a2df198c87949504046e2"
    },
    {
      "type": "FIX",
      "url": "https://github.com/liketrek/TREK/pull/1520"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "TREK MCP trip summary bypasses delegated OAuth read scopes"
}