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Advisory severityHigh7.8Microsoft Server

High [CVE-2026-77904] Windows Volume Manager Extension Driver Elevation of Privilege Vulnerability

This high-severity Microsoft Server advisory covers CVE-2026-77904 affecting Windows Server 2019, Windows Server 2022, Windows Server 2025.

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

CVE-2026-77904 Source published Source updated

VulniPulse record published Record updated

CVE-2026-77904
Affected products & platforms
Microsoft ServerWindows Server
Open source advisory

Summary

Windows Volume Manager Extension Driver Elevation of Privilege Vulnerability

Affected products named by the advisory: Windows Server 2019; Windows Server 2022; Windows Server 2025; Windows Server 2016; and 2 more.

Affected products named by the advisory: Windows Server 2012 R2.

Is CVE-2026-77904 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-77904 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-2026-77904?

Upgrade to a fixed release named by Microsoft:

  • KB5122876 (build 10.0.17763.9245)
  • KB5122882 (build 10.0.20348.5622)
  • KB5122878 (build 10.0.19045.7725)
  • KB5122871 (build 10.0.26100.33438)
  • KB5124008 (build 10.0.26100.9445)
  • KB5122880 (build 10.0.22631.7582)
  • KB5124012 (build 10.0.28000.2954)
  • KB5123099 (build 10.0.14393.9512)

Confirm against the vendor advisory before you patch.

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 10 Version 21H2 10.0.19044.0 before 10.0.19044.7725
  • Windows 10 Version 22H2 10.0.19045.0 before 10.0.19045.7725
  • Windows 11 version 23H2 10.0.22631.0 before 10.0.22631.7582
  • Windows 11 Version 23H2 10.0.22631.0 before 10.0.22631.7582
  • 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
  • Windows Server 2012 R2 6.3.9600.0 before 6.3.9600.23397

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

Fixed versions
  • KB5122876 (build 10.0.17763.9245)
  • KB5122882 (build 10.0.20348.5622)
  • KB5122878 (build 10.0.19045.7725)
  • KB5122871 (build 10.0.26100.33438)
  • KB5124008 (build 10.0.26100.9445)
  • KB5122880 (build 10.0.22631.7582)
  • KB5124012 (build 10.0.28000.2954)
  • KB5123099 (build 10.0.14393.9512)

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: KB5122876, KB5122882, KB5122878, KB5122871, KB5124008, KB5122880 (see the Microsoft Update Catalog).

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

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