CVE-2025-9611

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

CVSS 7.2 HIGHEPSS 0.8%CWE-749

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.2EPSS 0.8%KEV nãoPoC —Patch referenciado

Lifecycle

07 Jan 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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

Affected products

Microsoft · Playwright

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References

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