Summary
Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Unlikely. Customer action: Required.
Details
According to the CVSS metric, the attack vector is network (AV:N) and the user interaction is required (UI:R). What is the target context of the remote code execution?
This attack requires an authenticated client to click a link so that an unauthenticated attacker can initiate remote code execution.
Security updates
10.0.17763.9020 — https://support.microsoft.com/help/5099538
10.0.20348.5386 — https://support.microsoft.com/help/5099540
10.0.19044.7548 — https://support.microsoft.com/help/5099539
10.0.26100.33158 — https://support.microsoft.com/help/5099536
10.0.26200.8875 — https://support.microsoft.com/help/5101650
10.0.28000.2525 — https://support.microsoft.com/help/5101649
10.0.14393.9339 — https://support.microsoft.com/help/5099535
6.2.9200.26226 — https://support.microsoft.com/help/5099445
6.3.9600.23291 — https://support.microsoft.com/help/5099444
Vulnerabilities 1
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High 8.0
Windows PowerShell Remote Code Execution Vulnerability
Relative path traversal in Windows PowerShell allows an authorized attacker to execute code over a network.
Revision history
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#6
Updated an acknowledgement. This is an informational change only.
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#5
Updated an acknowledgement. This is an informational change only.
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#4
Acknowledgement Updated
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#3
Acknowledgement Updated
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#2
Acknowledgement Updated
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#1
Information published.
References
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CVE-2026-40400 Windows PowerShell Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40400
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss