CVE-2025-9611

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

Published Jan 7, 2026 CVSS 4.0 · 7.2 High EPSS 1.2% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Github GHSA Github GHSA GHSA-6fg3-hvw7-2fwq Microsoft Playwright MCP Server vulnerable to DNS Rebinding Attack; Allows Attackers Access to All Server Tools
History
Type Values Removed Values Added
CPEs cpe:2.3:a:microsoft:playwright:*:*:*:*:*:*:*:*
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Microsoft
Microsoft playwright
Vendors & Products Microsoft
Microsoft playwright
Type Values Removed Values Added
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.
Title Microsoft Playwright MCP Server < 0.0.40 DNS Rebinding via Missing Origin Header Validation
Weaknesses CWE-749
References
Metrics cvssV4_0

{'score': 7.2, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Nov 8, 2026, 2:00 PM
Reserved
Aug 28, 2025, 3:34 PM
Status
Deferred
Published
Jan 7, 2026, 12:17 PM
Modified
Oct 8, 2026, 4:16 PM