CVE-2026-62818

Windows Active Directory Certificate Services (AD CS) Remote Code Execution Vulnerability

State: Published
Severity: 8.8 High
Published: Aug 11, 2026
Updated: Oct 30, 2026
Reserved: Jul 14, 2026

Description

Use after free in Active Directory Certificate Services (AD CS) allows an authorized attacker to execute code over a network.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	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	microsoft

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
Windows 10 Version 1607Microsoft	10.0.14393.0 to before 10.0.14393.9418Affected
Windows 10 Version 1809Microsoft	10.0.17763.0 to before 10.0.17763.9121Affected
Windows Server 2012Microsoft	6.2.9200.0 to before 6.2.9200.26280Affected
Windows Server 2012 (Server Core installation)Microsoft	6.2.9200.0 to before 6.2.9200.26280Affected
Windows Server 2012 R2Microsoft	6.3.9600.0 to before 6.3.9600.23338Affected
Windows Server 2012 R2 (Server Core installation)Microsoft	6.3.9600.0 to before 6.3.9600.23338Affected
Windows Server 2016Microsoft	10.0.14393.0 to before 10.0.14393.9418Affected
Windows Server 2016 (Server Core installation)Microsoft	10.0.14393.0 to before 10.0.14393.9418Affected
Windows Server 2019Microsoft	10.0.17763.0 to before 10.0.17763.9121Affected
Windows Server 2019 (Server Core installation)Microsoft	10.0.17763.0 to before 10.0.17763.9121Affected
Windows Server 2022Microsoft	10.0.20348.0 to before 10.0.20348.5499Affected
Windows Server 2025Microsoft	10.0.26100.0 to before 10.0.26100.33296Affected
Windows Server 2025 (Server Core installation)Microsoft	10.0.26100.0 to before 10.0.26100.33296Affected

References

Windows Active Directory Certificate Services (AD CS) Remote Code Execution Vulnerabilityvendor-advisorypatch

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