CVE-2026-85805: Microsoft PowerShell Security Feature Bypass Vulnerability
Improperly implemented security check for standard in Windows PowerShell allows an unauthorized attacker to bypass a security feature over a network.
Other sources
Microsoft PowerShell Security Feature Bypass Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.3.9600.23470Patch KB5126836 - Upgrade
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Fixed in 6.2.9200.26434Patch KB5126835 - Upgrade
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Fixed in 10.0.19044.7807Patch KB5126657 - Upgrade
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Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
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Fixed in 10.0.14393.9612Patch KB5126868 - Upgrade
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Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
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Fixed in 10.0.22631.7652Patch KB5126653 - Upgrade
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Fixed in 10.0.26200.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
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Fixed in 10.0.17763.9376Patch KB5126651 - Upgrade
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Fixed in 10.0.26300.9711Patch KB5127648
Event History
Frequently Asked Questions
Which systems should be prioritized for review?
Review Microsoft Windows 10 and Windows 11 endpoints, plus Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025 systems that use Windows PowerShell. The issue is reachable over a network.
Does exploitation require an authenticated account or user interaction?
The supplied vector indicates no privileges are required, but user interaction is required. Exploitation is rated low complexity and network-accessible.
What is the expected impact if exploitation succeeds?
Successful exploitation bypasses a PowerShell security feature and has a high integrity impact. No confidentiality or availability impact is indicated in the supplied severity vector.