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CVE-2025-9611

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Date: January 6, 2026

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.

Severity Score

Related Resources (8)

https://github.com/microsoft/playwright-mcp
https://github.com/JLLeitschuh/security-research/security/advisories/GHSA-8rgw-6xp9-2fg3
https://www.vulncheck.com/advisories/microsoft-playwright-mcp-server-dns-rebinding-via-missing-origin-header-validation
https://nvd.nist.gov/vuln/detail/CVE-2025-9611
https://github.com/microsoft/playwright/commit/1313fbd
https://msrc.microsoft.com/report/vulnerability/VULN-164412
https://github.com/microsoft/playwright-mcp/issues/1206
https://www.mend.io/vulnerability-database/CVE-2025-9611

Severity Score

Weakness Type (CWE)

Exposed Dangerous Method or Function

CWE-749

Top Fix

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Upgrade Version

Upgrade to version @playwright/mcp - 0.0.40;@playwright/mcp - 0.0.40;https://github.com/microsoft/playwright.git - v1.56.0

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): CHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): HIGH

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