Untrusted Pointer Dereference in Microsoft Windows and Windows Server - CVE-2026-23670

Vulnerability identifier: #VU126004

CSH Severity: Low

CVSS v4: 7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-23670

CWE-ID: CWE-822

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to compromise the target system.

The vulnerability exists due to untrusted pointer dereference in Windows Virtualization-Based Security (VBS). A local administrator can bypass a security feature on the system.

Microsoft Windows
Windows Server

Install updates from vendor's website.

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7184, 10 22H2 10.0.19045.7184, 10 1607 10.0.14393.9060, 10 1809 10.0.17763.8644, 11 23H2 10.0.22631.6936, 11 24H2 10.0.26100.32690
Windows Server - addressed in versions 2012 R2 6.3.9600.23132, 2016 10.0.14393.9060, 2019 10.0.17763.8644, 2022 23H2 10.0.25398.2274, 2022 10.0.20348.5020, 2025 10.0.26100.32690

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23670

• Untrusted Pointer Dereference in Microsoft Windows Virtualization-Based Security (VBS)