---
id: CVE-2026-62818
title: >-
  Windows Active Directory Certificate Services (AD CS) Remote Code Execution
  Vulnerability
summary: >-
  Use after free in Active Directory Certificate Services (AD CS) allows an
  authorized attacker to execute code over a network.
severity: high
cvss: 8.8
cvssVector: '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'
cvssSource: cna
cwe:
  - CWE-416
vendor: Microsoft
product: Windows 10 Version 1607
affected:
  - windows_10_version_1607 >= 10.0.14393.0 < 10.0.14393.9418
  - windows_10_version_1809 >= 10.0.17763.0 < 10.0.17763.9121
  - windows_server_2012 >= 6.2.9200.0 < 6.2.9200.26280
  - windows_server_2012_server_core_installation >= 6.2.9200.0 < 6.2.9200.26280
  - windows_server_2012_r2 >= 6.3.9600.0 < 6.3.9600.23338
  - >-
    windows_server_2012_r2_server_core_installation >= 6.3.9600.0 <
    6.3.9600.23338
  - windows_server_2016 >= 10.0.14393.0 < 10.0.14393.9418
  - >-
    windows_server_2016_server_core_installation >= 10.0.14393.0 <
    10.0.14393.9418
  - windows_server_2019 >= 10.0.17763.0 < 10.0.17763.9121
  - >-
    windows_server_2019_server_core_installation >= 10.0.17763.0 <
    10.0.17763.9121
  - windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5499
  - windows_server_2025 >= 10.0.26100.0 < 10.0.26100.33296
  - >-
    windows_server_2025_server_core_installation >= 10.0.26100.0 <
    10.0.26100.33296
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-12T03:56:27.515283Z'
published: '2026-08-11'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T13:44:52.263Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-62818'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62818'
    label: >-
      Windows Active Directory Certificate Services (AD CS) Remote Code
      Execution Vulnerability
tags:
  - cve.org
epss: 0.00972
epssPercentile: 0.60524
ingestedAt: '2026-09-08T18:07:34.898Z'
---

## Overview

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

## Affected

- `windows_10_version_1607 >= 10.0.14393.0 < 10.0.14393.9418`
- `windows_10_version_1809 >= 10.0.17763.0 < 10.0.17763.9121`
- `windows_server_2012 >= 6.2.9200.0 < 6.2.9200.26280`
- `windows_server_2012_server_core_installation >= 6.2.9200.0 < 6.2.9200.26280`
- `windows_server_2012_r2 >= 6.3.9600.0 < 6.3.9600.23338`
- `windows_server_2012_r2_server_core_installation >= 6.3.9600.0 < 6.3.9600.23338`
- `windows_server_2016 >= 10.0.14393.0 < 10.0.14393.9418`
- `windows_server_2016_server_core_installation >= 10.0.14393.0 < 10.0.14393.9418`
- `windows_server_2019 >= 10.0.17763.0 < 10.0.17763.9121`
- `windows_server_2019_server_core_installation >= 10.0.17763.0 < 10.0.17763.9121`
- `windows_server_2022 >= 10.0.20348.0 < 10.0.20348.5499`
- `windows_server_2025 >= 10.0.26100.0 < 10.0.26100.33296`
- `windows_server_2025_server_core_installation >= 10.0.26100.0 < 10.0.26100.33296`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.