CVE-2026-78444 Microsoft Failover Cluster Remote Code Execution Vulnerability
An untrusted pointer dereference in Windows Failover Cluster allows remote attackers to execute arbitrary code without authentication.
- 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-2026-78444?
CVE-2026-78444 is a high-severity vulnerability in Microsoft Windows 10 1809, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Untrusted pointer dereference in Windows Failover Cluster allows an unauthorized attacker to execute code over a network.
Weakness: CWE-822
Which versions are affected by CVE-2026-78444?
It affects 4 products.
Products include Microsoft Windows 10 1809, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2025.
How do I fix CVE-2026-78444?
No fix has been published for CVE-2026-78444 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-78444 being exploited?
There is no known exploitation of CVE-2026-78444 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-vp2w-vv5p-6vcv.