CVE-2026-20938

Windows Virtualization-Based Security (VBS) Enclave Elevation of Privilege Vulnerability

CVE-2026-20938 is fixed in 6 products on 1 platform, first by KB5073455, released January 13, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.8

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0047

40th percentile

<p>Untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows 11 Version 23H2 for ARM64-based Systems	22631.6491	KB5073455	Jan 13, 2026
Windows 11 Version 23H2 for x64-based Systems	22631.6491	KB5073455	Jan 13, 2026
Windows 11 Version 24H2 for ARM64-based Systems		KB5074109	Jan 13, 2026
Windows 11 Version 24H2 for x64-based Systems		KB5074109	Jan 13, 2026
Windows 11 Version 25H2 for ARM64-based Systems		KB5074109	Jan 13, 2026
Windows 11 Version 25H2 for x64-based Systems		KB5074109	Jan 13, 2026

Details

Published
January 13, 2026
Weakness
Untrusted Pointer Dereference
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20938

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