CVE-2026-20920 — Use After Free in Microsoft Windows 11 Version 22h3

CWE-416 — Use After Free5 documents5 sources
Severity
7.8HIGHNVD
EPSS
0.0%
top 89.94%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
5
Microsoft Windows 11 Version 22h3Microsoft Windows 11 Version 23h2Microsoft Windows Server 2022+2 more
Timeline
PublishedJan 13

Description

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

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9

Affected Packages5 packages

▶NVDmicrosoft/windows< 10.0.20348.4648+1
▶NVDmicrosoft/windows_11_23h2< 10.0.22631.6491
▶CVEListV5microsoft/windows_server_202210.0.20348.0 — 10.0.20348.4648
▶CVEListV5microsoft/windows_11_version_22h310.0.22631.0 — 10.0.22631.6491
▶CVEListV5microsoft/windows_11_version_23h210.0.22631.0 — 10.0.22631.6491

🔴Vulnerability Details

2
CVEList
Win32k Elevation of Privilege Vulnerability↗2026-01-13
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GHSA
GHSA-8264-x5xf-gjhc: Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally↗2026-01-13
▶

📋Vendor Advisories

1
Microsoft
Win32k Elevation of Privilege Vulnerability↗2026-01-13
▶

🕵️Threat Intelligence

1
Wiz
CVE-2026-20920 Impact, Exploitability, and Mitigation Steps | Wiz↗
▶
CVE-2026-20920 — Use After Free in Microsoft | cvebase