Unauthenticated PowerShell execution via exposed HTTP control plane
Published Jun 17, 2026 · Updated Jun 17, 2026
Missing authentication in Windows-MCP before 0.7.5 allows remote attackers to execute arbitrary PowerShell commands over HTTP. The SSE and Streamable HTTP entry points build FastMCP without an authentication provider, apply wildcard CORS, and pass caller-controlled commands to PowerShell through the registered PowerShell tool. Exploitation requires an affected HTTP transport to be running and grants command execution as the Windows user hosting the server; the default stdio transport is unaffected.
Summary
What happened
Missing authentication in Windows-MCP before 0.7.5 allows remote attackers to execute arbitrary PowerShell commands over HTTP. The SSE and Streamable HTTP entry points build FastMCP without an authentication provider, apply wildcard CORS, and pass caller-controlled commands to PowerShell through the registered PowerShell tool. Exploitation requires an affected HTTP transport to be running and grants command execution as the Windows user hosting the server; the default stdio transport is unaffected.
The record
- CVE
- CVE-2026-48989
- Published
- Jun 17, 2026
- Updated
- Jun 17, 2026
- Vendor
- CursorTouch
- Product
- Windows-MCP
- Classifications
- CWE-306, T1059.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 17, 2026CVE publishedPublication date reported by the CVE source.
- Jun 17, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 0.7.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- GitHub advisory protocol proofproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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