GHSA-6FG3-HVW7-2FWQ

Vulnerability from github – Published: 2026-01-07 12:31 – Updated: 2026-01-07 20:02
VLAI?
Summary
Microsoft Playwright MCP Server vulnerable to DNS Rebinding Attack; Allows Attackers Access to All Server Tools
Details

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.

Severity ?
7.2 (High)
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
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@playwright/mcp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.40"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-9611"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-749"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-07T20:02:55Z",
    "nvd_published_at": "2026-01-07T12:17:06Z",
    "severity": "HIGH"
  },
  "details": "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\u2019s web browser and send unauthorized requests to a locally running MCP server, resulting in unintended invocation of MCP tool endpoints.",
  "id": "GHSA-6fg3-hvw7-2fwq",
  "modified": "2026-01-07T20:02:55Z",
  "published": "2026-01-07T12:31:25Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/JLLeitschuh/security-research/security/advisories/GHSA-8rgw-6xp9-2fg3"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-9611"
    },
    {
      "type": "WEB",
      "url": "https://github.com/microsoft/playwright-mcp/issues/1206"
    },
    {
      "type": "WEB",
      "url": "https://github.com/microsoft/playwright/commit/1313fbd"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/microsoft/playwright-mcp"
    },
    {
      "type": "WEB",
      "url": "https://msrc.microsoft.com/report/vulnerability/VULN-164412"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/microsoft-playwright-mcp-server-dns-rebinding-via-missing-origin-header-validation"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Microsoft Playwright MCP Server vulnerable to DNS Rebinding Attack; Allows Attackers Access to All Server Tools"
}


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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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