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Thursday, 29 October 2026
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Incident database

Windows-MCP unauthenticated HTTP control plane allowed arbitrary PowerShell execution

Versions of the open-source Windows-MCP server before 0.7.5 exposed the MCP control plane over HTTP without authentication and with wildcard CORS, allowing attackers from arbitrary origins or non-browser clients to invoke a PowerShell tool and run commands as the user running Windows-MCP. The issue was fixed in version 0.7.5.

Disclosed 17 June 2026 · Record updated 1 October 2026

Impact

Remote attackers could reach the unauthenticated MCP control plane and achieve arbitrary PowerShell command execution as the Windows user running Windows-MCP.

Our coverage

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-48989