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CVE-2025-9611 — Vulnerability in @playwright/mcp — CVE Details

HIGH

Microsoft Playwright MCP Server vulnerable to DNS Rebinding Attack; Allows Attackers Access to All Server Tools

Published January 7, 2026Updated February 3, 2026Source: osv

Summary

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.

Advisory Timeline

  • First published January 7, 2026 (278 days ago).
  • Last revised February 3, 2026 — 27 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm
Update @playwright/mcp to 0.0.40 or later
npm install @playwright/mcp@0.0.40

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: npm (1).

PackageEcosystemAffectedFixed In
@playwright/mcp
npm
All versions0.0.40

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
—
Confidentiality
—
Integrity
—
Availability
—

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

References

Frequently Asked Questions

What is CVE-2025-9611?
Microsoft Playwright MCP Server vulnerable to DNS Rebinding Attack; Allows Attackers Access to All Server Tools This vulnerability has been assigned a severity rating of HIGH (CVSS score: 8.8/10).
How do I check if my project is affected by CVE-2025-9611?
CVE-2025-9611 affects @playwright/mcp. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2025-9611 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
8.8

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-6fg3-hvw7-2fwq
GHSA-8rgw-6xp9-2fg3

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