CVE-2026-55001 Active Directory Domain Services Elevation of Privilege Vulnerability
An authorized local attacker can elevate privileges by exploiting improper certificate validation in Windows Active Directory.
- 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-2026-55001?
CVE-2026-55001 is a high-severity vulnerability in Microsoft Windows 10 1607, published on 14 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Improper certificate validation in Windows Active Directory allows an authorized attacker to elevate privileges locally.
Weakness: CWE-295
Which versions are affected by CVE-2026-55001?
It affects 6 products.
Products include Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2025.
How do I fix CVE-2026-55001?
No fix has been published for CVE-2026-55001 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-55001 being exploited?
There is no known exploitation of CVE-2026-55001 in the wild and no public exploit code.
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-2x53-82m9-jcgf.