High 7.2Published Jan 7, 2026

CVE-2025-9611Microsoft Playwright MCP Server < 0.0.40 DNS Rebinding via Missing Origin Header Validation

Updated under an hour ago (2026-10-19 11:23 UTC)

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It affects Microsoft Playwright. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 7.2 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-749
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Oct 8, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Microsoft Playwright microsoft:playwright (from the name)	before 0.0.40	CNA record

References

https://github.com/JLLeitschuh/security-research/security/advisories/GHSA-8rgw-6xp9-2fg3vendor-advisory
https://github.com/microsoft/playwright/commit/1313fbdpatch
https://www.vulncheck.com/advisories/microsoft-playwright-mcp-server-dns-rebinding-via-missing-origin-header-validationthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.