CVE-2026-20811 Win32k Elevation of Privilege Vulnerability
A type confusion flaw in Windows Win32K allows an authorized local attacker to elevate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20811?
CVE-2026-20811 is a high-severity vulnerability in Microsoft Windows 11 23h2, published on 13 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Access of resource using incompatible type ('type confusion') in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
Which versions are affected by CVE-2026-20811?
It affects 6 products.
Products include Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows Server 2022, Microsoft Windows Server 2022 23h2, Microsoft Windows Server 2025.
How do I fix CVE-2026-20811?
No fix has been published for CVE-2026-20811 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20811 being exploited?
There is no known exploitation of CVE-2026-20811 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 11 23h2
- CVE-2026-81963 Microsoft Windows Link Following
- CVE-2026-100219 Microsoft QUIC Remote Code Execution Vulnerability
- CVE-2026-96909 Windows BitLocker Remote Code Execution Vulnerability
- CVE-2026-62815 Microsoft QUIC Remote Code Execution Vulnerability
- CVE-2026-45657 Windows Kernel Remote Code Execution Vulnerability
Sources
Also known as GHSA-rcr5-pjrv-hxh5.