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Vulnerability · Published Jun 17, 2026 · Assigned by GitHub_M

CVE-2026-48989Windows-MCP: HTTP transports expose unauthenticated PowerShell control with wildcard CORS

High 8.9

In plain English

A high-severity missing authentication in Windows-MCP from CursorTouch. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.9High
Exploit odds (30 days)0.4%top 65.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIwindows-mcp0.7.5GHSA-vrxg-gm77-7q5g
PyPIwindows-mcp0.7.5PYSEC-2026-3425

Affected products (as reported)

VendorProductVersions
CursorTouch Windows-MCP < 0.7.5

Weakness: CWE-306 · 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

References