7.8
High
CVE-2026-55001 Improper certificate validation in Windows Active Directory allows an authorized attacker to elevate privileges locally
Description
Improper certificate validation in Windows Active Directory allows an authorized attacker to elevate privileges locally.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 10 Version 1607 10.0 | 10.0.14393.0 → < 10.0.14393.9339 | 10.0.14393.9339 |
| Windows 10 Version 1809 10.0 | 10.0.17763.0 → < 10.0.17763.9020 | 10.0.17763.9020 |
| Windows Server 2016 10.0 | 10.0.14393.0 → < 10.0.14393.9339 | 10.0.14393.9339 |
| Windows Server 2016 (Server Core installation) 10.0 | 10.0.14393.0 → < 10.0.14393.9339 | 10.0.14393.9339 |
| Windows Server 2019 10.0 | 10.0.17763.0 → < 10.0.17763.9020 | 10.0.17763.9020 |
| Windows Server 2019 (Server Core installation) 10.0 | 10.0.17763.0 → < 10.0.17763.9020 | 10.0.17763.9020 |
| Windows Server 2022 10.0 | 10.0.20348.0 → < 10.0.20348.5386 | 10.0.20348.5386 |
| Windows Server 2025 10.0 | 10.0.26100.0 → < 10.0.26100.33158 | 10.0.26100.33158 |
| Windows Server 2025 (Server Core installation) 10.0 | 10.0.26100.0 → < 10.0.26100.33158 | 10.0.26100.33158 |
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