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High severity · published Jan 13, 2026
CVE-2026-20811
Win32k Elevation of Privilege Vulnerability
7.8
CVSS
0.5%
EPSS
No
On KEV
Description
Access of resource using incompatible type ('type confusion') 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 24H2 · Microsoft
10.0.26100.0 before 10.0.26100.7623 · source: vendor
W1
Windows 11 Version 25H2 · Microsoft
10.0.26200.0 before 10.0.26200.7623 · source: vendor
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
WS
Windows Server 2025 · Microsoft
10.0.26100.0 before 10.0.26100.32230 · source: vendor, NVD
WS
Windows Server 2025 (Server Core installation) · Microsoft
10.0.26100.0 before 10.0.26100.32230 · source: vendor
W1
Windows 11 23h2 · Microsoft
before 10.0.22631.6491 · source: NVD
W1
Windows 11 24h2 · Microsoft
before 10.0.26100.7623 · source: NVD
W1
Windows 11 25h2 · Microsoft
before 10.0.26200.7623 · source: NVD
WS
Windows Server 2022 23h2 · Microsoft
before 10.0.25398.2092 · source: NVD
Affected product
W1
Windows 11 version 23H2
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-20811
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-20811
Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20811
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