Microsoft Playwright MCP Server < 0.0.40 DNS Rebinding via Missing Origin Header Validation

{
  "id": "924ce8f740eb04ce80bf7910c85e68de9d13c162a23a9f6c517672806ae57a6a",
  "url": "https://osv.dev/vulnerability/CVE-2025-9611",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Microsoft Playwright MCP Server < 0.0.40 DNS Rebinding via Missing Origin Header Validation",
    "summary": "Microsoft Playwright MCP Server versions prior to 0.0.40 fails to validate the Origin header on incoming connections. This allows an attacker to perform a DNS rebinding attack via a victim’s web browser and send unauthorized requests to a locally running MCP server, resulting in unintended invocation of MCP tool endpoints.",
    "evidence": "osv:CVE-2025-9611",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-9611",
      "aliases": [
        "CVE-2025-9611",
        "GHSA-6fg3-hvw7-2fwq",
        "GHSA-8rgw-6xp9-2fg3"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:L/SI:L/SA:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/microsoft/playwright",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1313fbd"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "1313fbd"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-9611.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.202729880Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/9xxx/CVE-2025-9611.json",
        "https://github.com/JLLeitschuh/security-research/security/advisories/GHSA-8rgw-6xp9-2fg3",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-9611",
        "https://www.vulncheck.com/advisories/microsoft-playwright-mcp-server-dns-rebinding-via-missing-origin-header-validation",
        "https://github.com/microsoft/playwright/commit/1313fbd",
        "https://github.com/microsoft/playwright"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-749"
        ],
        "cna_assigner": "VulnCheck",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "0.0.40"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "0.0.40"
                  }
                ],
                "source": "CPE_FIELD",
                "strategy": "CPEApplicability"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "0.0.40"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/9xxx/CVE-2025-9611.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-9611",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494747,
  "published_at": "2026-01-07T04:24:13.705+00:00"
}