7.2

CVSS Score

4.0

-

CVSS Score

Basic Information

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CVE-2025-9611

CVE-2025-9611: Microsoft Playwright MCP Server < 0.0.40 DNS Rebinding via Missing Origin Header Validation

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.

(GitHub Advisory)

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CVE-2025-9611

CVE-2025-9611:

7.2

CVSS Score

4.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
@playwright/mcp	npm	< 0.0.40	0.0.40

Technical Details

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Root Cause Analysis

The vulnerability lies in the Playwright MCP server's failure to validate the Host header on incoming connections, making it susceptible to DNS rebinding attacks. The provided commit patch addresses this by introducing a Host header check within the installHttpTransport function located in packages/playwright/src/mcp/sdk/http.ts. The patch adds logic to verify that the Host header of an incoming request matches a configurable list of allowed hosts. If the header does not match, the server rejects the request with a 403 Forbidden status. The vulnerable function is identified as installHttpTransport because it contains the request handler where this crucial validation was missing. An attacker could exploit this by causing a victim's browser to resolve a malicious domain to the localhost address (127.0.0.1), thereby bypassing the same-origin policy and sending commands to the local MCP server.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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