High7.8Microsoft Server

High [CVE-2026-20924] Windows Management Services Elevation of Privilege Vulnerability

This high-severity Microsoft Server advisory covers CVE-2026-20924 affecting Windows Server 2019 (Server Core installation), Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025 (Server Core installation).

CVE-2026-20924 Published Jan 13, 2026Updated by vendor Jul 30, 2026

CVE-2026-20924

Affected products & platforms

Microsoft ServerWindows Server

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Summary

Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.

Affected products named by the advisory: Windows Server 2019; Windows Server 2019 (Server Core installation); Windows Server 2022; Windows Server 2022, 23H2 Edition (Server Core installation); and 2 more.

Affected products named by the advisory: Windows Server 2025 (Server Core installation).

Affected versions

Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.8276
Windows 10 Version 21H2 10.0.19044.0 before 10.0.19044.6809
Windows 10 Version 22H2 10.0.19045.0 before 10.0.19045.6809
Windows 11 version 23H2 10.0.22631.0 before 10.0.22631.6491
Windows 11 Version 23H2 10.0.22631.0 before 10.0.22631.6491
Windows 11 Version 24H2 10.0.26100.0 before 10.0.26100.7623
Windows 11 Version 25H2 10.0.26200.0 before 10.0.26200.7623
Windows Server 2019 10.0.17763.0 before 10.0.17763.8276
Windows Server 2019 (Server Core installation) 10.0.17763.0 before 10.0.17763.8276
Windows Server 2022 10.0.20348.0 before 10.0.20348.4648
Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 before 10.0.25398.2092
Windows Server 2025 10.0.26100.0 before 10.0.26100.32230

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

Fixed versions

10.0.17763.8276
10.0.19044.6809
10.0.19045.6809
10.0.22631.6491
10.0.26100.7623
10.0.26200.7623
10.0.20348.4648
10.0.25398.2092
10.0.26100.32230

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

Mitigation

Upgrade to a fixed release: 10.0.17763.8276, 10.0.19044.6809, 10.0.19045.6809, 10.0.22631.6491, 10.0.26100.7623, 10.0.26200.7623. 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

Sources

Official and corroborating records used to build this advisory.

Official vendor advisoryofficial
Official advisory page fetched and parsed for the summary, affected/fixed versions and remediation guidance it provides.
Microsoft Server
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2026-20924 instead of the raw feed document.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-20924NVD CVE.org MITRE

Official resources

MSRC Security Update Guide
Official documentation
Filter by this CVE for per-product KB numbers, severity and exploitability assessment.

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