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Vulnerability record · CVE-2025-9611 · published 7 January 2026

CVE-2025-9611: Microsoft Playwright MCP Server versions prior to 0.0.40 fails to validate the Origin header on incoming conne…

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.

7.2 CVSS 4.0 High EPSS 1.2% · top 32.0% CWE-749 · CWE-749 Deferred
7.2CVSS 4.0 base score
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
14 Jul 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/JLLeitschuh/security-research/security/advisories/GHSA-8rgw-6xp9-2fg3
https://github.com/microsoft/playwright/commit/1313fbd
https://www.vulncheck.com/advisories/microsoft-playwright-mcp-server-dns-rebinding-via-missing-origin-header-validation

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Source: NIST National Vulnerability Database (record CVE-2025-9611), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.