CVE-2026-48989 json
Windows-MCP: HTTP transports expose unauthenticated PowerShell control with wildcard CORS
published 2026-05-21 5 mo ago modified 2026-10-26 14 d ago also GHSA-vrxg-gm77-7q5g , PYSEC-2026-3425 , EUVD-2026-37800
- cvss
- 8.9
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 34%
- public exploits
- 0
- none known
Summary
Windows-MCP is an open-source project that integrates AI agents with Windows. In versions prior to 0.7.5, certain HTTP modes exposed the MCP control plane without authentication while enabling wildcard CORS (allow_origins=*, allow_methods=*, allow_headers=*). Because the same server also exposed a PowerShell tool that executes caller-controlled commands as the Windows user running Windows-MCP, attackers could reach the control plane from arbitrary origins or non-browser clients and achieve arbitrary PowerShell execution. This issue was fixed in version 0.7.5.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 4 mo ago
Exploit prediction
0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P |
| CNA | 4.0 | 8.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/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 |
|---|---|---|---|
| pypi | windows-mcp | <0.7.5 |
0.7.5 |
Affected products
- CursorTouch Windows-MCP
Classification
- Weakness
-
- CWE-306 Missing Authentication for Critical Functionality
References
-
github.com
/CursorTouch/Windows-MCP/security/advisories/GHSA-vrxg-gm77-7q5g
web
-
github.com
/CursorTouch/Windows-MCP/releases/tag/v0.7.5
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-48989
advisory
-
github.com
/CursorTouch/Windows-MCP
package
-
pypi.org
/project/windows-mcp
package
-
github.com
/advisories/GHSA-vrxg-gm77-7q5g
advisory
Sources
- CVE List CVE-2026-48989
- GitHub Advisory GHSA-vrxg-gm77-7q5g
- NVD CVE-2026-48989
- OSV PYSEC-2026-3425
Fencer Vulns 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.