CVE-2026-21519 Microsoft Windows Type Confusion
A type confusion flaw in the Desktop Window Manager allows local attackers to elevate privileges on Windows systems.
- Exploited in the wild
- Since 10 Feb 2026
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-21519?
CVE-2026-21519 is a high-severity memory corruption vulnerability in Microsoft Windows 10 1607, 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
Access of resource using incompatible type ('type confusion') in Desktop Window Manager allows an authorized attacker to elevate privileges locally.
Weakness: CWE-843
Which versions are affected by CVE-2026-21519?
It affects 12 products.
Products include Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2 and 6 more.
How do I fix CVE-2026-21519?
No fix has been published for CVE-2026-21519 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 3 Mar 2026.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-21519 being exploited?
Yes. Attackers have exploited CVE-2026-21519 in the wild since at least 10 Feb 2026.
Other vulnerabilities in Microsoft Windows 10 1607
- CVE-2026-33824 Microsoft Internet Key Exchange (IKE) Service Extensions Double Free
- CVE-2026-21510 Microsoft Windows Shell Protection Mechanism Failure
- CVE-2026-21513 Microsoft MSHTML Framework Protection Mechanism Failure
- CVE-2023-32049 Microsoft Windows Defender SmartScreen Security Feature Bypass
- CVE-2023-29360 Microsoft Streaming Service Untrusted Pointer Dereference
Sources
Also known as GHSA-h77q-4hph-8vf3.