CVE-2026-48989

Windows-MCP: HTTP transports expose unauthenticated PowerShell control with wildcard CORS

Published Jun 17, 2026 CVSS 4.0 · 8.9 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-vrxg-gm77-7q5g Windows-MCP: HTTP transports expose unauthenticated PowerShell control with wildcard CORS
History
Type Values Removed Values Added
First Time appeared Cursortouch
Cursortouch windows-mcp
Vendors & Products Cursortouch
Cursortouch windows-mcp
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Windows-MCP: HTTP transports expose unauthenticated PowerShell control with wildcard CORS
Weaknesses CWE-306
References
Metrics cvssV4_0

{'score': 8.9, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jun 18, 2026, 3:44 PM
Reserved
May 26, 2026, 11:26 PM
Status
Awaiting Analysis
Published
Jun 17, 2026, 10:16 PM
Modified
Oct 26, 2026, 12:10 PM