CVE-2026-48989

High

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.

SeverityHigh

CVSS8.9

Exploit probability34. percentile0.4%

ProductWindows-mcp

PublishedJun 17, 2026

First seenJun 17, 2026

Weakness typeCWE-306Missing authentication for critical function

How to fix

Update

windows-mcp0.7.5 or later

Affected products

Product	Affected versions	Fixed in
windows-mcpPyPI	v < 0.7.5	0.7.5

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