CVE-2025-9611 - CVE House
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Status published High CVE-2025-9611

Microsoft Playwright MCP Server < 0.0.40 DNS Rebinding via Missing Origin Header Validation

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Jonathan Leitschuh

References

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Affected Vendor

Affected Software

Playwright
Vulnerable Versions:
0

Timeline

Official Publish: January 7th, 2026
Last Modified: July 14th, 2026
Added to House: July 22nd, 2026

CVSS Vectors

Weaknesses (CWE)

CWE-749

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1059 Command and Scripting Interpreter
Execution
T1068 Exploitation for Privilege Escalation
Privilege Escalation
T1565.002 Stored Data Manipulation
Impact