CVE-2026-48989 — Windows-MCP: HTTP transports expose unauthenticated PowerShell control with wildcard CORS
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…
Published: 2026-06-17 · CVSS: 8.9 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7