Use After Free in Microsoft Windows_11_23h2
CVE-2026-20920
Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
Vulnerability class: Use-After-Free
EPSS: 0.005 (37.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Microsoft Windows_11_23h2
- Microsoft Windows 11 Version 22h3 — versions 10.0.22631.0
- Microsoft Windows 11 Version 23h2 — versions 10.0.22631.0
- Microsoft Windows Server 2022 — versions 10.0.20348.0
- Microsoft Windows_server_2022
- Microsoft Windows_server_2022_23h2
- Microsoft Windows Server 2022, 23h2 Edition (Server Core Installation) — versions 10.0.25398.0
Weakness classification (CWE)
References
- secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-20920?
- CVE-2026-20920 is a high-severity vulnerability in Microsoft Windows_11_23h2, classified under Use After Free. CVSS score: 7.8/10. Published 2026-01-13.
- How severe is CVE-2026-20920?
- High severity. CVSS v3 base score is 7.8 out of 10.