Vulnerability details
CVE-2025-9611
Microsoft Playwright
Microsoft Playwright MCP Server < 0.0.40 DNS Rebinding via Missing Origin Header Validation
CVSS 4.0
7.2High
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.2High | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | 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
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Microsoft | Playwright | v < 0.0.40 | CVEProject cvelistV5 (CNA) |
References and advisories
3- 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
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Details
- Published
- 2026-01-07
- Last updated
- 2026-11-08
- State
- Published
- Assigner (CNA)
- VulnCheck
Exploit prediction (EPSS)
1.22%
Probability of exploitation in 30 days
68.9%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Proof of concept
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-749Exposed Dangerous Method or Function