CVE-2025-9611

High

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.

SeverityHigh

CVSS7.2

Exploit probability—

Product@playwright/mcp

PublishedJan 7, 2026

First seenJan 7, 2026

Weakness typeCWE-749CWE-749

How to fix

Update

@playwright/mcp0.0.40 or later

Patches

github.com/microsoft/playwright/commit/1313fbd

Vendor advisories

github.com/JLLeitschuh/security-research/security/advisories/GHSA-8rgw-6xp9-2fg3

Affected products

Product	Affected versions	Fixed in
@playwright/mcpnpm	v < 0.0.40	0.0.40

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