CVE-2025-9611 json
Microsoft Playwright MCP Server < 0.0.40 DNS Rebinding via Missing Origin Header Validation
published 10mo ago modified yesterday also EUVD-2026-1179 , GHSA-6fg3-hvw7-2fwq , GHSA-8rgw-6xp9-2fg3
- cvss
- 7.2
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.2%
- EPSS 1.2% chance of exploitation in 30 days, percentile 68%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- npm @playwright/mcp 0.0.40
- Microsoft Playwright 0.0.40
Is CVE-2025-9611 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 10mo ago
Exploit prediction
1.22% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 7.2 | 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 |
| CNA | 4.0 | 7.2 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @playwright/mcp | <0.0.40 |
0.0.40 |
Affected products
- Microsoft Playwright
Classification
- Weakness
-
- CWE-749 Exposed Dangerous Method or Function
References
-
github.com
/microsoft/playwright/commit/1313fbd
patch, web
-
github.com
/JLLeitschuh/security-research/security/advisories/GHSA-8rgw-6xp9-2fg3
vendor-advisory, web
-
vulncheck.com
/advisories/microsoft-playwright-mcp-server-dns-rebinding-via-missing-origin-header-validation
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2025-9611
advisory
-
github.com
/microsoft/playwright-mcp/issues/1206
web
-
github.com
/microsoft/playwright-mcp
package
-
msrc.microsoft.com
/report/vulnerability/VULN-164412
web
Sources
- CVE List CVE-2025-9611
- GitHub Advisory GHSA-6fg3-hvw7-2fwq
- NVD CVE-2025-9611
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.