CVE-2026-54121 Active Directory Certificate Services Elevation of Privilege Vulnerability
An authorized attacker can elevate privileges over the network due to improper authorization in Active Directory Certificate Services.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-54121?
CVE-2026-54121 is a high-severity missing authorization vulnerability in Microsoft Windows 10 1607, published on 14 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Improper authorization in Active Directory Certificate Services (AD CS) allows an authorized attacker to elevate privileges over a network.
Weakness: CWE-285
Which versions are affected by CVE-2026-54121?
It affects 7 products.
Products include Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022 and 1 more.
How do I fix CVE-2026-54121?
No fix has been published for CVE-2026-54121 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-54121 being exploited?
There is no known exploitation of CVE-2026-54121 in the wild and no public exploit code.
Public exploit code: 15 proofs of concept on GitHub.
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-64qv-2ffq-h4w6.