high7.8
CVE-2026-55001
Improper certificate validation in Windows Active Directory allows an authorized attacker to elevate privileges locally.
Impact
Improper certificate validation in Windows Active Directory allows an authorized attacker to elevate privileges locally.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Windows 10 1607 | before 10.0.14393.9339 |
| Microsoft | Windows 10 1809 | before 10.0.17763.9020 |
| Microsoft | Windows Server 2016 | before 10.0.14393.9339 |
| Microsoft | Windows Server 2019 | before 10.0.17763.9020 |
| Microsoft | Windows Server 2022 | before 10.0.20348.5386 |
| Microsoft | Windows Server 2025 | before 10.0.26100.33158 |
| Microsoft | Windows 10 Version 1607 | from 10.0.14393.0 before 10.0.14393.9339 |
| Microsoft | Windows 10 Version 1809 | from 10.0.17763.0 before 10.0.17763.9020 |
| Microsoft | Windows Server 2016 | from 10.0.14393.0 before 10.0.14393.9339 |
| Microsoft | Windows Server 2016 (Server Core Installation) | from 10.0.14393.0 before 10.0.14393.9339 |
| Microsoft | Windows Server 2019 | from 10.0.17763.0 before 10.0.17763.9020 |
| Microsoft | Windows Server 2019 (Server Core Installation) | from 10.0.17763.0 before 10.0.17763.9020 |
| Microsoft | Windows Server 2022 | from 10.0.20348.0 before 10.0.20348.5386 |
| Microsoft | Windows Server 2025 | from 10.0.26100.0 before 10.0.26100.33158 |
| Microsoft | Windows Server 2025 (Server Core Installation) | from 10.0.26100.0 before 10.0.26100.33158 |