High severity · published Jan 13, 2026
CVE-2026-20920
Win32k Elevation of Privilege Vulnerability
7.8
CVSS
0.5%
EPSS
No
On KEV
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:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
W1
Windows 11 version 23H2 · Microsoft
10.0.22631.0 before 10.0.22631.6491; 10.0.22631.0 before 10.0.22631.6491 · source: vendor
WS
Windows Server 2022 · Microsoft
10.0.20348.0 before 10.0.20348.4648 · source: vendor, NVD
WS
Windows Server 2022, 23H2 Edition (Server Core installation) · Microsoft
10.0.25398.0 before 10.0.25398.2092 · source: vendor
W1
Windows 11 23h2 · Microsoft
before 10.0.22631.6491 · source: NVD
WS
Windows Server 2022 23h2 · Microsoft
before 10.0.25398.2092 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-20920
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-20920
Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20920
More from Windows 11 version 23H2
9.8
CVE-2026-33824
Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability
8.8
CVE-2026-96951
Windows Shell Security Feature Bypass Vulnerability
8.8
CVE-2026-21510
Windows Shell Security Feature Bypass Vulnerability
8.8
CVE-2026-21513
MSHTML Framework Security Feature Bypass Vulnerability
8.8
CVE-2025-33073
Windows SMB Client Elevation of Privilege Vulnerability