CVE-2026-66802 Windows Device Health Attestation (DHA) Remote Code Execution Vulnerability
An unauthorized attacker can execute code over a network due to a race condition in Windows Device Health Attestation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-66802?
CVE-2026-66802 is a high-severity vulnerability in Microsoft Windows 10 1809, published on 11 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Device Health Attestation (DHA) allows an unauthorized attacker to execute code over a network.
Which versions are affected by CVE-2026-66802?
It affects 5 products.
Products include Microsoft Windows 10 1809, Microsoft Windows 11 26h1, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2025.
How do I fix CVE-2026-66802?
No fix has been published for CVE-2026-66802 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-66802 being exploited?
There is no known exploitation of CVE-2026-66802 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10 1809
- CVE-2024-29988 Microsoft SmartScreen Prompt Security Feature Bypass
- CVE-2024-21412 Microsoft Windows Internet Shortcut Files Security Feature Bypass
- CVE-2025-62221 Microsoft Windows Use After Free
- CVE-2025-30400 Microsoft Windows DWM Core Library Use-After-Free
- CVE-2024-21338 Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control
Sources
Also known as GHSA-xp2p-9v56-q74x.