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Advisory severityHigh8.0Microsoft Server

High [CVE-2026-33826] Windows Active Directory Remote Code Execution Vulnerability

This high-severity Microsoft Server advisory covers CVE-2026-33826 affecting Windows Server 2012 R2 (Server Core installation), Windows Server 2016 (Server Core installation), Windows Server 2019 (Server Core installation).

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-33826 Source published Source updated

VulniPulse record published

CVE-2026-33826
Affected products & platforms
Microsoft ServerWindows Server
Open source advisory

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Summary

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

Affected products named by the advisory: Windows Server 2012 R2; Windows Server 2012 R2 (Server Core installation); Windows Server 2016; Windows Server 2016 (Server Core installation); and 6 more.

Affected products named by the advisory: Windows Server 2019 (Server Core installation); Windows Server 2022, 23H2 Edition (Server Core installation); Windows Server 2025 (Server Core installation).

Affected versions
  • Windows Server 2012 R2 6.3.9600.0 before 6.3.9600.23132
  • Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 before 6.3.9600.23132
  • Windows Server 2016 10.0.14393.0 before 10.0.14393.9060
  • Windows Server 2016 (Server Core installation) 10.0.14393.0 before 10.0.14393.9060
  • Windows Server 2019 10.0.17763.0 before 10.0.17763.8644
  • Windows Server 2019 (Server Core installation) 10.0.17763.0 before 10.0.17763.8644
  • Windows Server 2022 10.0.20348.0 before 10.0.20348.5020
  • Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 before 10.0.25398.2274
  • Windows Server 2025 10.0.26100.0 before 10.0.26100.32690
  • Windows Server 2025 (Server Core installation) 10.0.26100.0 before 10.0.26100.32690

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

Fixed versions
  • 6.3.9600.23132
  • 10.0.14393.9060
  • 10.0.17763.8644
  • 10.0.20348.5020
  • 10.0.25398.2274
  • 10.0.26100.32690

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

Mitigation

Upgrade to a fixed release: 6.3.9600.23132, 10.0.14393.9060, 10.0.17763.8644, 10.0.20348.5020, 10.0.25398.2274, 10.0.26100.32690. 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 months ago·verify at source

Discussion(0)

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