Vulnerability · Published Jul 14, 2026 · Assigned by microsoft
CVE-2026-54121Active Directory Certificate Services Elevation of Privilege Vulnerability
High 8.8
In plain English
A high-severity security flaw in Windows 10 Version 1607 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.8%top 44.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
Improper authorization in Active Directory Certificate Services (AD CS) allows an authorized attacker to elevate privileges over a network.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0 – before 10.0.14393.9339 |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 – before 10.0.17763.9020 |
| Microsoft | Windows Server 2012 | 6.2.9200.0 – before 6.2.9200.26226 |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.9200.0 – before 6.2.9200.26226 |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0 – before 6.3.9600.23291 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0 – before 6.3.9600.23291 |
| Microsoft | Windows Server 2016 | 10.0.14393.0 – before 10.0.14393.9339 |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 – before 10.0.14393.9339 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 – before 10.0.17763.9020 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 – before 10.0.17763.9020 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 – before 10.0.20348.5386 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 – before 10.0.26100.33158 |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 – before 10.0.26100.33158 |
Weakness: CWE-285 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References
- Active Directory Certificate Services Elevation of Privilege Vulnerability vendor-advisory, patch