CVE-2025-9611 HIGH

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

Vendor Microsoft
Product Playwright
Weakness CWE-749
Published January 7, 2026
Last update March 5, 2026
View on NVD All CVEs

CVSS base score

7.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction —
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:L/SI:L/SA:L

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

January 7, 2026 CVE published
March 5, 2026 Record updated