Microsoft Playwright MCP Server up to 0.0.39 Header Origin routine

Summaryinfo

A vulnerability was found in Microsoft Playwright MCP Server up to 0.0.39. It has been declared as problematic. Affected by this issue is some unknown functionality of the component Header Handler. Such manipulation of the argument Origin leads to routine. This vulnerability is listed as CVE-2025-9611. The attack may be performed from remote. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Microsoft Playwright MCP Server up to 0.0.39. It has been rated as problematic. Affected by this issue is some unknown processing of the component Header Handler. The manipulation of the argument Origin with an unknown input leads to a routine vulnerability. Using CWE to declare the problem leads to CWE-749. The product provides an Applications Programming Interface (API) or similar interface for interaction with external actors, but the interface includes a dangerous method or function that is not properly restricted. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was presented by Jonathan Leitschuh. The advisory is available at github.com. This vulnerability is handled as CVE-2025-9611 since 08/28/2025. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 01/07/2026).

Upgrading to version 0.0.40 eliminates this vulnerability.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• Microsoft

Name

• Playwright MCP Server

Version

• 0.0.1
• 0.0.2
• 0.0.3
• 0.0.4
• 0.0.5
• 0.0.6
• 0.0.7
• 0.0.8
• 0.0.9
• 0.0.10
• 0.0.11
• 0.0.12
• 0.0.13
• 0.0.14
• 0.0.15
• 0.0.16
• 0.0.17
• 0.0.18
• 0.0.19
• 0.0.20
• 0.0.21
• 0.0.22
• 0.0.23
• 0.0.24
• 0.0.25
• 0.0.26
• 0.0.27
• 0.0.28
• 0.0.29
• 0.0.30
• 0.0.31
• 0.0.32
• 0.0.33
• 0.0.34
• 0.0.35
• 0.0.36
• 0.0.37
• 0.0.38
• 0.0.39

License

• commercial

Website

• Vendor: https://www.microsoft.com/

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