Review reviewHigh

CVE-2026-33826

Microsoft Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016

Improper input validation in Windows Active Directory allows an authorized attacker to execute code over an adjacent network.

PRIORITY ASSESSMENT

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.53%

Technical severityCVSS 8

Improper input validation in Windows Active Directory allows an authorized attacker to execute code over an adjacent network.

Product: Microsoft Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016
Affected versions: >= 6.3.9600.0 < 6.3.9600.23132, >= 10.0.14393.0 < 10.0.14393.9060, >= 10.0.17763.0 < 10.0.17763.8644, >= 10.0.20348.0 < 10.0.20348.5020, >= 10.0.25398.0 < 10.0.25398.2274, >= 10.0.26100.0 < 10.0.26100.32690, r2, < 10.0.14393.9060, < 10.0.17763.8644, < 10.0.20348.5020, < 10.0.25398.2274, < 10.0.26100.32690
Fixed versions: 10.0.14393.9060, 10.0.17763.8644, 10.0.20348.5020, 10.0.25398.2274, 10.0.26100.32690

Confirm exposure before applying a vendor-supported change.

1
Identify
Confirm that Microsoft Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.