CVE-2026-62818Critical

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

Assessment

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

Severity: Critical
CVSS base score: 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Impact: Remote Code Execution
EPSS, next 30 days: 0.9%Higher than 58.5% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
Exploitability: Exploitation Less Likely
Publicly disclosed: No
Customer action: Required: apply the update
Component: Active Directory Certificate Services (AD CS)
Weakness: CWE-416: Use After Free
Issued by: Microsoft
Published: 11 Aug 2026 · August 2026
Last revised: 11 Aug 2026

8 KBs

KB	Type	Restart	Applies to	Other CVEs
KB5120228	Security Hotpatch Update	Required	Windows Server 2025, Windows Server 2025 (Server Core installation)	All CVEs in KB5120228
KB5120229	Security Hotpatch Update	Required	Windows Server 2022, Windows Server 2022 (Server Core installation)	All CVEs in KB5120229
KB5120233	Security Update	Required	Windows Server 2025, Windows Server 2025 (Server Core installation)	All CVEs in KB5120233
KB5120238	Security Update	Required	Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019 and 1 more	All CVEs in KB5120238
KB5120242	Security Update	Required	Windows Server 2022, Windows Server 2022 (Server Core installation)	All CVEs in KB5120242
KB5120385	Monthly Rollup	Required	Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation)	All CVEs in KB5120385
KB5120386	Monthly Rollup	Required	Windows Server 2012, Windows Server 2012 (Server Core installation)	All CVEs in KB5120386
KB5120418	Security Update	Required	Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows Server 2016 and 1 more	All CVEs in KB5120418

ESU, Windows

16 affected products