7.2
High
CVE-2025-9611 Microsoft Playwright MCP Server versions prior to 0.0.40 fails to validate the Origin header on incoming connections
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Playwright 0.0 | earliest → < 0.0.40 | 0.0.40 |