Summary
Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
How could an attacker exploit this vulnerability?
An attacker could host a malicious server and convince a user to connect to it from an affected client. When the client processes the server's response, the attacker could execute code on the client system. User interaction is required.
Security updates
7.4.21 — https://github.com/PowerShell/Announcements/blob/main/pwsh/2026/10/CVE-2026-96251.md
Vulnerabilities 1
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High 8.8
Microsoft PowerShell Remote Code Execution Vulnerability
Reliance on untrusted inputs in a security decision in Microsoft PowerShell allows an unauthorized attacker to execute code over a network.
Revision history
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#4
Updated an acknowledgement. This is an informational change only.
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#3
Updated an acknowledgement. This is an informational change only.
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#2
Corrected Fixed Build Number and Download links in the Security Updates table. This is an informational change only.
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#1
Information published.
References
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CVE-2026-96251 Microsoft PowerShell Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96251
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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