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Advisory severityHigh7.0Microsoft Server

High [CVE-2026-77899] Windows Security Center Elevation of Privilege Vulnerability

This high-severity Microsoft Server advisory covers CVE-2026-77899 affecting Windows Server 2012.

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

CVE-2026-77899 Source published Source updated

VulniPulse record published Record updated

CVE-2026-77899
Affected products & platforms
Microsoft ServerWindows Server
Open source advisory

Summary

Windows Security Center Elevation of Privilege Vulnerability

Affected product named by the advisory: Windows Server 2012.

Is CVE-2026-77899 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-77899 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-77899?

Upgrade to a fixed release named by Microsoft:

  • KB5124008 (build 10.0.26100.9445)
  • KB5124012 (build 10.0.28000.2954)
  • KB5123065 (build 6.2.9200.26349)

Confirm against the vendor advisory before you patch.

Affected versions
  • Windows 11 Version 24H2 10.0.26100.0 before 10.0.26100.9445
  • Windows 11 Version 25H2 10.0.26200.0 before 10.0.26200.9445
  • Windows 11 version 26H1 10.0.28000.0 before 10.0.28000.2954
  • 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

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

Fixed versions
  • KB5124008 (build 10.0.26100.9445)
  • KB5124012 (build 10.0.28000.2954)
  • KB5123065 (build 6.2.9200.26349)

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

Mitigation checklist

Recommended fix / mitigation
  • Install the applicable security update for your platform: KB5124008, KB5124012, KB5123065 (see the Microsoft Update Catalog).

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

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