CVE-2026-55001

EUVD-2026-44010
Improper certificate validation in Windows Active Directory allows an authorized attacker to elevate privileges locally.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.8 HIGH
LOCAL
LOW
LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 21.82%
Affected Products (NVD)
VendorProductVersion
microsoftwindows_10_1607
𝑥
< 10.0.14393.9339
microsoftwindows_10_1607
𝑥
< 10.0.14393.9339
microsoftwindows_10_1809
𝑥
< 10.0.17763.9020
microsoftwindows_10_1809
𝑥
< 10.0.17763.9020
microsoftwindows_server_2016
𝑥
< 10.0.14393.9339
microsoftwindows_server_2019
𝑥
< 10.0.17763.9020
microsoftwindows_server_2022
𝑥
< 10.0.20348.5386
microsoftwindows_server_2025
𝑥
< 10.0.26100.33158
𝑥
= Vulnerable software versions
Windows Releases
Platform
Version
Windows 10
1607 (x64, x86)
KB5099535
1809 (x64, x86)
KB5099538
Windows Server 2016
Server Core
KB5099535
Standard
KB5099535
Windows Server 2019
Server Core
KB5099538
Standard
KB5099538
Windows Server 2022
Standard
KB5099540
Windows Server 2025
Server Core
KB5099536
Standard
KB5099536
Common Weakness Enumeration
References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55001