What is CVE-2026-20819?

CVE-2026-20819 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Windows Virtualization-Based Security (VBS) Information Disclosure Vulnerability

Which CVE IDs does CVE-2026-20819 cover?

CVE-2026-20819 covers the following CVE IDs: CVE-2026-20819. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-20819?

CVE-2026-20819 has a CVSS v3 base score of 5.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-20819?

CVE-2026-20819 affects 6 products, including: Windows 11 Version 23H2 for ARM64-based Systems; Windows 11 Version 23H2 for x64-based Systems; Windows 11 Version 24H2 for ARM64-based Systems; Windows 11 Version 24H2 for x64-based Systems; Windows 11 Version 25H2 for ARM64-based Systems; and others — see the full list on the advisory page.

CVE-2026-20819HighCVSS 5.5

Windows Virtualization-Based Security (VBS) Information Disclosure Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

June 2, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-20819 →

📋 Description

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

🎯 Affected products6

Windows 11 Version 23H2 for ARM64-based Systems
Windows 11 Version 23H2 for x64-based Systems
Windows 11 Version 24H2 for ARM64-based Systems
Windows 11 Version 24H2 for x64-based Systems
Windows 11 Version 25H2 for ARM64-based Systems
Windows 11 Version 25H2 for x64-based Systems

✅ Remediation

KB5074109 (Security Update) — fixed build 10.0.26200.7623 KB5073455 (Security Update) — fixed build 10.0.22631.6491 KB5074109 (Security Update) — fixed build 10.0.26100.7623

🔗 References (5)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20819
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5074109
referencehttps://support.microsoft.com/help/5074109
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5073455
referencehttps://support.microsoft.com/help/5073455