Authorization bypass through user-controlled key in Microsoft Windows and Windows Server - CVE-2026-70185
Published: October 14, 2026
Vulnerability identifier: #VU154626
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-70185
CWE-ID: CWE-639
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to execute untrusted code with capabilities normally blocked by security restrictions.
The vulnerability exists due to protection mechanism failure in Windows PowerShell when enforcing restrictions on local code execution. A local user can bypass Windows Defender Application Control and PowerShell Constrained Language Mode restrictions to execute untrusted code with capabilities normally blocked by those protections.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-70185
Install security update from vendor's website.
Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7807, 10 1607 10.0.14393.9612, 10 1809 10.0.17763.9376, 11 23H2 10.0.22631.7652, 11 24H2 10.0.26100.9711, 11 25H2 10.0.26200.9711, 11 26H1 10.0.28000.3231
Windows Server - addressed in versions 2012 R2 6.3.9600.23470, 2012 6.2.9200.26434, 2016 10.0.14393.9612, 2019 10.0.17763.9376, 2022 10.0.20348.5761, 2025 10.0.26100.33650
Windows Server - addressed in versions 2012 R2 6.3.9600.23470, 2012 6.2.9200.26434, 2016 10.0.14393.9612, 2019 10.0.17763.9376, 2022 10.0.20348.5761, 2025 10.0.26100.33650