What is CVE-2026-20920?

CVE-2026-20920 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Win32k Elevation of Privilege Vulnerability

Which CVE IDs does CVE-2026-20920 cover?

CVE-2026-20920 covers the following CVE IDs: CVE-2026-20920. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-20920?

CVE-2026-20920 has a CVSS v3 base score of 7.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-20920?

CVE-2026-20920 affects 5 products, including: Windows 11 Version 23H2 for ARM64-based Systems; Windows 11 Version 23H2 for x64-based Systems; Windows Server 2022; Windows Server 2022 (Server Core installation); Windows Server 2022, 23H2 Edition (Server Core installation).

CVE-2026-20920HighCVSS 7.8

Win32k Elevation of Privilege Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

June 2, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-20920 →

📋 Description

Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.

🎯 Affected products5

Windows 11 Version 23H2 for ARM64-based Systems
Windows 11 Version 23H2 for x64-based Systems
Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows Server 2022, 23H2 Edition (Server Core installation)

✅ Remediation

KB5073457 (Security Update) — fixed build 10.0.20348.4648 KB5073455 (Security Update) — fixed build 10.0.22631.6491 KB5073450 (Security Update) — fixed build 10.0.25398.2092

🔗 References (7)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20920
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5073457
referencehttps://support.microsoft.com/help/5073457
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5073455
referencehttps://support.microsoft.com/help/5073455
patchhttps://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5073450
referencehttps://support.microsoft.com/help/5073450