CVE-2026-62818
Windows Active Directory Certificate Services (AD CS) Remote Code Execution Vulnerability
CVE-2026-62818 is fixed in 16 products on 1 platform, first by KB5120418, released August 11, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
Urgent
CVSS
8.8
Critical
Exploitation
None reported
Exploitation Less Likely
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0091
60th percentile
<p>Use after free in Active Directory Certificate Services (AD CS) allows an authorized attacker to execute code over a network.</p>
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Microsoft | |||
| Windows 10 Version 1607 for 32-bit Systems | 14393.9418 | KB5120418 | Aug 11, 2026 |
| Windows 10 Version 1607 for x64-based Systems | 14393.9418 | KB5120418 | Aug 11, 2026 |
| Windows 10 Version 1809 for 32-bit Systems | 17763.9121 | KB5120238 | Aug 11, 2026 |
| Windows 10 Version 1809 for x64-based Systems | 17763.9121 | KB5120238 | Aug 11, 2026 |
| Windows Server 2012 | KB5120386 | Aug 11, 2026 | |
| Windows Server 2012 (Server Core installation) | KB5120386 | Aug 11, 2026 | |
| Windows Server 2012 R2 | KB5120385 | Aug 11, 2026 | |
| Windows Server 2012 R2 (Server Core installation) | KB5120385 | Aug 11, 2026 | |
| Windows Server 2016 | 14393.9418 | KB5120418 | Aug 11, 2026 |
| Windows Server 2016 (Server Core installation) | 14393.9418 | KB5120418 | Aug 11, 2026 |
| Windows Server 2019 | 17763.9121 | KB5120238 | Aug 11, 2026 |
| Windows Server 2019 (Server Core installation) | 17763.9121 | KB5120238 | Aug 11, 2026 |
| Windows Server 2022 | 20348.5440 | KB5120229 | Aug 11, 2026 |
| Windows Server 2022 | 20348.5499 | KB5120242 | Aug 11, 2026 |
| Windows Server 2022 (Server Core installation) | 20348.5440 | KB5120229 | Aug 11, 2026 |
| Windows Server 2022 (Server Core installation) | 20348.5499 | KB5120242 | Aug 11, 2026 |
| Windows Server 2025 | 26100.33222 | KB5120228 | Aug 11, 2026 |
| Windows Server 2025 | 26100.33296 | KB5120233 | Aug 11, 2026 |
| Windows Server 2025 (Server Core installation) | 26100.33222 | KB5120228 | Aug 11, 2026 |
| Windows Server 2025 (Server Core installation) | 26100.33296 | KB5120233 | Aug 11, 2026 |
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