CVE-2025-9611
Microsoft Playwright MCP Server < 0.0.40 DNS Rebinding via Missing Origin Header Validation
- State
- Published
- Severity
- 7.2 High
- Published
- Jan 7, 2026
- Updated
- Oct 8, 2026
- Reserved
- Aug 28, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.2 High | 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 | VulnCheck |
Weaknesses
- CWE-749 Exposed Dangerous Method or Function
Affected Products
| Product | Versions |
|---|---|
PlaywrightMicrosoft |
|
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
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