Medium · 5.3 CVE-2026-105590 EUVD-2026-121720GHSA-3j6g-7mcg-82gx

Windows Active Directory Certificate Services Security Feature Bypass

Published Nov 10, 2026 · Updated Nov 13, 2026 · Assigned by microsoft

Vendor: Microsoft Product: Windows Server 2016 Product: Windows Server 2016 (Server Core installation) Product: Windows Server 2019 Product: Windows Server 2019 (Server Core installation) Product: Windows Server 2022 Product: Windows Server 2025 Product: Windows Server 2025 (Server Core installation) Platform: Windows

Description

Improper certificate validation in Windows Active Directory Certificate Services allows an authorized attacker to bypass a security feature over a network.

Affected products

Vendor	Product	Affected	Fixed
Microsoft	Windows Server 2016	10.0.14393.0 – < 10.0.14393.9688	10.0.14393.9688
Microsoft	Windows Server 2016 (Server Core installation)	10.0.14393.0 – < 10.0.14393.9688	10.0.14393.9688
Microsoft	Windows Server 2019	10.0.17763.0 – < 10.0.17763.9487	10.0.17763.9487
Microsoft	Windows Server 2019 (Server Core installation)	10.0.17763.0 – < 10.0.17763.9487	10.0.17763.9487
Microsoft	Windows Server 2022	10.0.20348.0 – < 10.0.20348.5870	10.0.20348.5870
Microsoft	Windows Server 2025	10.0.26100.0 – < 10.0.26100.33822	10.0.26100.33822
Microsoft	Windows Server 2025 (Server Core installation)	10.0.26100.0 – < 10.0.26100.33822	10.0.26100.33822

Advisories 2

WID-SEC-2026-4478 Microsoft Windows: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 2026
MSRC-CVE-2026-105590 Windows Active Directory Certificate Services Security Feature Bypass Microsoft Security Response Center · Nov 10, 2026

References

Windows Active Directory Certificate Services Security Feature Bypass vendor-advisory patch