GitHub Advisoryadvisory · npm
GHSA-6fg3-hvw7-2fwq Microsoft Playwright MCP Server vulnerable to DNS Rebinding Attack; Allows Attackers Access to All Server Tools
HIGH
Official page ↗
- Aliases
- CVE-2025-9611
- Ecosystem
- npm
- Packages
- @playwright/mcp
- Severity
- High
- CVSS vector
- 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
- Weaknesses
- CWE-749
- Reviewed
- 2026-01-07
Affected packages
• npm @playwright/mcp: < 0.0.40 → fixed in 0.0.40
Description
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.
Related
Alias · CVE (1)
- CVE-2025-9611 Microsoft Playwright MCP Server versions prior to 0.0.40 fails to validate the Origin header on incoming connections. vulnerability
Weakness · CWE (1)
- CWE-749 Exposed Dangerous Method or Function weakness
References
- https://github.com/JLLeitschuh/security-research/security/advisories/GHSA-8rgw-6xp9-2fg3 web
- https://nvd.nist.gov/vuln/detail/CVE-2025-9611 advisory
- https://github.com/microsoft/playwright-mcp/issues/1206 web
- https://github.com/microsoft/playwright/commit/1313fbd web
- https://github.com/microsoft/playwright-mcp package
- https://msrc.microsoft.com/report/vulnerability/VULN-164412 web
- https://www.vulncheck.com/advisories/microsoft-playwright-mcp-server-dns-rebinding-via-missing-origin-header-validation web