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High7.8Microsoft Server

High [CVE-2026-69821] Active Directory Certificate Services (AD CS) Elevation of Privilege Vulnerability

This high-severity Microsoft Server advisory covers CVE-2026-69821 affecting Windows Server 2012 (Server Core installation), Windows Server 2012 R2 (Server Core installation), Windows Server 2016 (Server Core installation).

CVE-2026-69821 Published Sep 8, 2026Updated by vendor Sep 8, 2026
CVE-2026-69821
Affected products & platforms
Microsoft ServerWindows Server
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Summary

Improper encoding or escaping of output in Active Directory Certificate Services (AD CS) allows an authorized attacker to elevate privileges locally.

Affected products named by the advisory: Windows Server 2012; Windows Server 2012 (Server Core installation); Windows Server 2012 R2; Windows Server 2012 R2 (Server Core installation); and 7 more.

Affected products named by the advisory: Windows Server 2016 (Server Core installation); Windows Server 2019 (Server Core installation); Windows Server 2022; Windows Server 2025 (Server Core installation).

Affected versions
  • Windows 10 Version 1607 10.0.14393.0 before 10.0.14393.9512
  • Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.9245
  • Windows Server 2012 6.2.9200.0 before 6.2.9200.26349
  • Windows Server 2012 (Server Core installation) 6.2.9200.0 before 6.2.9200.26349
  • Windows Server 2012 R2 6.3.9600.0 before 6.3.9600.23397
  • Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 before 6.3.9600.23397
  • Windows Server 2016 10.0.14393.0 before 10.0.14393.9512
  • Windows Server 2016 (Server Core installation) 10.0.14393.0 before 10.0.14393.9512
  • Windows Server 2019 10.0.17763.0 before 10.0.17763.9245
  • Windows Server 2019 (Server Core installation) 10.0.17763.0 before 10.0.17763.9245
  • Windows Server 2022 10.0.20348.0 before 10.0.20348.5622
  • Windows Server 2025 10.0.26100.0 before 10.0.26100.33438

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Fixed versions
  • 10.0.14393.9512
  • 10.0.17763.9245
  • 6.2.9200.26349
  • 6.3.9600.23397
  • 10.0.20348.5622
  • 10.0.26100.33438

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Mitigation

Upgrade to a fixed release: 10.0.14393.9512, 10.0.17763.9245, 6.2.9200.26349, 6.3.9600.23397, 10.0.20348.5622, 10.0.26100.33438. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

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