Security advisory

{
  "id": "164a86608761476b96af265ec8022c20f3165b5bc54e28645c2956a26e1488da",
  "url": "https://osv.dev/vulnerability/CVE-2025-66689",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2025-66689",
    "summary": "A path traversal vulnerability exists in Zen MCP Server before 9.8.2 that allows authenticated attackers to read arbitrary files on the system. The vulnerability is caused by flawed logic in the is_dangerous_path() validation function that uses exact string matching against a blacklist of system directories. Attackers can bypass these restrictions by accessing subdirectories of blacklisted paths.",
    "evidence": "osv:CVE-2025-66689",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-66689",
      "aliases": [
        "CVE-2025-66689"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/BeehiveInnovations/pal-mcp-server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "fa78edca0b6bc04ab00ddf5694d855f1b946b87d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "9.8.2"
                      }
                    ],
                    "source": "DESCRIPTION"
                  },
                  {
                    "cpe": "cpe:2.3:a:busymac:pal_mcp_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "9.8.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v9.8.1",
            "v9.8.0",
            "v9.7.0",
            "v9.6.0",
            "v9.5.0",
            "v9.4.2",
            "v9.4.1",
            "v9.4.0",
            "v9.3.1",
            "v9.2.1",
            "v9.2.0",
            "v9.1.4",
            "v9.1.3",
            "v9.1.1",
            "v9.0.4",
            "v9.0.0",
            "v8.0.2",
            "v8.0.1",
            "v8.0.0",
            "v7.8.0",
            "v7.7.0",
            "v7.6.0",
            "v7.5.2",
            "v7.4.0",
            "v7.2.0",
            "v7.1.1",
            "v7.1.0",
            "v7.0.2",
            "v6.1.0",
            "v6.0.0",
            "v5.22.0",
            "v5.17.4",
            "v5.17.0",
            "v5.16.0",
            "v5.15.0",
            "v5.14.0",
            "v5.13.0",
            "v5.12.0",
            "v5.11.2",
            "v5.11.1",
            "v5.11.0",
            "v5.10.3",
            "v5.10.2",
            "v5.10.1",
            "v5.10.0",
            "v5.9.0",
            "v5.8.6",
            "v1.1.0",
            "v5.8.5"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-66689.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.165674901Z",
      "provider": "osv",
      "references": [
        "https://github.com/Team-Off-course/MCP-Server-Vuln-Analysis/blob/main/CVE-2025-66689.md",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66689.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-66689",
        "https://github.com/BeehiveInnovations/zen-mcp-server/issues/293"
      ],
      "provider_metadata": {
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66689.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-66689",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505761,
  "published_at": "2026-01-12T00:00:00+00:00"
}