CVE-2026-21250 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-2026-21250?
CVE-2026-21250 is a high-severity vulnerability in Microsoft Windows 11 24h2, 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-2026-21250?
It affects 4 products.
Products include Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows Server 2022 23h2, Microsoft Windows Server 2025.
How do I fix CVE-2026-21250?
No fix has been published for CVE-2026-21250 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-21250 being exploited?
There is no known exploitation of CVE-2026-21250 in the wild and no public exploit code.
Public exploit code: 1 Exploit-DB entry and 1 proofs of concept on GitHub.
Other vulnerabilities in Microsoft Windows 11 24h2
- CVE-2025-60710 Microsoft Windows Link Following
- CVE-2026-54990 Remote Desktop Client Remote Code Execution Vulnerability
- CVE-2025-50165 Windows Graphics Component Remote Code Execution Vulnerability
- CVE-2025-21311 Windows NTLM V1 Elevation of Privilege Vulnerability
- CVE-2026-108463 Windows SmartScreen Security Feature Bypass Vulnerability
Sources
Also known as GHSA-xmfc-7rh5-84qx.