CVE-2026-62818: Windows Active Directory Certificate Services (AD CS) Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 8.8)

CVSS Vector

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

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Aug

Released

2026-08-11

Description

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

FAQ

How could an attacker exploit this vulnerability? An authenticated attacker could exploit this vulnerability by sending a specially crafted request to an affected service over the network. Successful exploitation could allow the attacker to execute code on the target system.

Affected Products (16)

Windows

• Windows 10 Version 1809 for 32-bit Systems
• Windows 10 Version 1809 for x64-based Systems
• Windows Server 2019
• Windows Server 2019 (Server Core installation)
• Windows Server 2022
• Windows Server 2022 (Server Core installation)
• Windows Server 2025 (Server Core installation)
• Windows Server 2025
• Windows 10 Version 1607 for 32-bit Systems
• Windows 10 Version 1607 for x64-based Systems
• Windows Server 2016
• Windows Server 2016 (Server Core installation)

ESU

• Windows Server 2012
• Windows Server 2012 (Server Core installation)
• Windows Server 2012 R2
• Windows Server 2012 R2 (Server Core installation)

Security Updates (8)

• 5120238
• 5120242
• 5120229
• 5120233
• 5120228
• 5120418
• 5120385
• 5120386

Revision History

• 2026-08-11: Information published.