High · 7.8 CVE-2026-45487 EUVD-2026-35673GHSA-fj7f-jv57-m7jh

Windows Program Compatibility Assistant Service Elevation of Privilege Vulnerability

Published Jun 9, 2026 · Updated Nov 10, 2026 · Assigned by microsoft

Vendor: Microsoft 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 11 version 26H1 Product: Windows Server 2022 Product: Windows Server 2025 Product: Windows Server 2025 (Server Core installation) Platform: Windows

Description

Time-of-check time-of-use (TOCTOU) race condition in Program Compatibility Assistant Service allows an authorized attacker to elevate privileges locally.

Affected products

Vendor	Product	Affected	Fixed
Microsoft	Windows 10 Version 21H2	10.0.19044.0 – < 10.0.19044.7417	10.0.19044.7417
Microsoft	Windows 10 Version 22H2	10.0.19045.0 – < 10.0.19045.7417	10.0.19045.7417
Microsoft	Windows 11 version 23H2	10.0.22631.0 – < 10.0.22631.7219	10.0.22631.7219
Microsoft	Windows 11 Version 24H2	10.0.26100.0 – < 10.0.26100.8655	10.0.26100.8655
Microsoft	Windows 11 Version 25H2	10.0.26200.0 – < 10.0.26200.8655	10.0.26200.8655
Microsoft	Windows 11 version 26H1	10.0.28000.0 – < 10.0.28000.2269	10.0.28000.2269
Microsoft	Windows Server 2022	10.0.20348.0 – < 10.0.20348.5256	10.0.20348.5256
Microsoft	Windows Server 2025	10.0.26100.0 – < 10.0.26100.32995	10.0.26100.32995
Microsoft	Windows Server 2025 (Server Core installation)	10.0.26100.0 – < 10.0.26100.32995	10.0.26100.32995

Advisories 3

WID-SEC-2026-1849 Microsoft Windows: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
NCSC-2026-0181 Kwetsbaarheden verholpen in Microsoft Windows NCSC-NL (Netherlands) · Jun 9, 2026
MSRC-CVE-2026-45487 Windows Program Compatibility Assistant Service Elevation of Privilege Vulnerability Microsoft Security Response Center · Jun 9, 2026

References

Windows Program Compatibility Assistant Service Elevation of Privilege Vulnerability vendor-advisory patch