High · 7.8 CVE-2026-20873 EUVD-2026-2151GHSA-rfrm-3m8m-j83r

Windows Management Services Elevation of Privilege Vulnerability

Published Jan 13, 2026 · Updated Jul 30, 2026 · Assigned by microsoft

Vendor: Microsoft Product: Windows 10 Version 1809 Product: Windows 10 Version 21H2 Product: Windows 10 Version 22H2 Product: Windows 11 version 23H2 Product: Windows 11 Version 24H2 Product: Windows 11 Version 25H2 Product: Windows Server 2019 Product: Windows Server 2019 (Server Core installation) Product: Windows Server 2022 Product: Windows Server 2022, 23H2 Edition (Server Core installation) Product: Windows Server 2025 Product: Windows Server 2025 (Server Core installation) Platform: Windows

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Management Services allows an authorized attacker to elevate privileges locally.

Affected products

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

Advisories 3

NCSC-2026-0007 Kwetsbaarheden verholpen in Microsoft Windows NCSC-NL (Netherlands) · Apr 10, 2026
WID-SEC-2026-0083 Microsoft Windows : Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 2, 2026
MSRC-CVE-2026-20873 Windows Management Services Elevation of Privilege Vulnerability Microsoft Security Response Center · Jan 13, 2026

References

Windows Management Services Elevation of Privilege Vulnerability vendor-advisory patch