Vulnerability · Published Jan 7, 2026 · Assigned by VulnCheck
CVE-2025-9611Microsoft Playwright MCP Server < 0.0.40 DNS Rebinding via Missing Origin Header Validation
High 7.2
In plain English
A high-severity security flaw in Playwright from Microsoft. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 69% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @playwright/mcp | 0.0.40 | GHSA-6fg3-hvw7-2fwq |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Playwright | 0 – before 0.0.40 |
Weakness: CWE-749 · Vector: 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
- https://github.com/JLLeitschuh/security-research/security/advisories/GHSA-8rgw-6xp9-2fg3 vendor-advisory
- https://github.com/microsoft/playwright/commit/1313fbd patch
- https://www.vulncheck.com/advisories/microsoft-playwright-mcp-server-dns-rebinding-via-missing-origin-header-validation third-party-advisory