CVE-2026-21232 Windows HTTP.sys Elevation of Privilege Vulnerability
An authorized local attacker can exploit an untrusted pointer dereference in Windows HTTP.sys 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-2026-21232?
CVE-2026-21232 is a high-severity vulnerability in Microsoft Windows 11 23h2, published on 10 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Untrusted pointer dereference in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.
Weakness: CWE-822
Which versions are affected by CVE-2026-21232?
It affects 5 products.
Products include Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows Server 2022 23h2, Microsoft Windows Server 2025.
How do I fix CVE-2026-21232?
No fix has been published for CVE-2026-21232 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-21232 being exploited?
There is no known exploitation of CVE-2026-21232 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-5gf4-2f6r-6gcj.