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CVE-2026-20819: Windows Virtualization-Based Security (VBS) Information Disclosure Vulnerability

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-13 · updated 2026-07-30
• Weakness: CWE-822

Description

Untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to disclose information locally.

Affected products

• Microsoft Windows 11: before 10.0.22631.6491 — fixed in 10.0.22631.6491
• Microsoft Windows 11: before 10.0.26100.7623 — fixed in 10.0.26100.7623
• Microsoft Windows 11 25H2: before 10.0.26200.7623 — fixed in 10.0.26200.7623
• Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.6491 — fixed in 10.0.22631.6491
• Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.7623 — fixed in 10.0.26100.7623
• Microsoft Windows 11 25H2: from 10.0.26200.0 before 10.0.26200.7623 — fixed in 10.0.26200.7623

How to fix

Upgrade to a fixed version: Microsoft Windows 11 10.0.22631.6491; Microsoft Windows 11 10.0.26100.7623; Microsoft Windows 11 25H2 10.0.26200.7623; Microsoft Windows 11 10.0.22631.6491; Microsoft Windows 11 10.0.26100.7623; Microsoft Windows 11 25H2 10.0.26200.7623. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20819

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