CVE-2026-32220: UEFI Secure Boot Security Feature Bypass Vulnerability

Severity: medium (CVSS 4.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-14 · updated 2026-10-15
Weakness: CWE-284

Description

Improper access control in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to bypass a security feature locally.

Affected products

Microsoft Windows 11: before 10.0.26100.8246 — fixed in 10.0.26100.8246
Microsoft Windows 11 25H2: before 10.0.26200.8246 — fixed in 10.0.26200.8246
Microsoft Windows 11 version 26H1: before 10.0.28000.1836 — fixed in 10.0.28000.1836
Microsoft Windows Server 2025: before 10.0.26100.32690 — fixed in 10.0.26100.32690
Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.8246 — fixed in 10.0.26100.8246
Microsoft Windows 11 25H2: from 10.0.26200.0 before 10.0.26200.8246 — fixed in 10.0.26200.8246
Microsoft Windows 11 version 26H1: from 10.0.28000.0 before 10.0.28000.1836 — fixed in 10.0.28000.1836
Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.32690 — fixed in 10.0.26100.32690

How to fix

Upgrade to a fixed version: Microsoft Windows 11 10.0.26100.8246; Microsoft Windows 11 25H2 10.0.26200.8246; Microsoft Windows 11 version 26H1 10.0.28000.1836; Microsoft Windows Server 2025 10.0.26100.32690; Microsoft Windows 11 10.0.26100.8246; Microsoft Windows 11 25H2 10.0.26200.8246; Microsoft Windows 11 version 26H1 10.0.28000.1836; Microsoft Windows Server 2025 10.0.26100.32690. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32220

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