Medium · 5.5 CVE-2026-50381 EUVD-2026-43844GHSA-2vv6-fvmm-g8r3

Composite Image File System driver (cimfs.sys) Information Disclosure Vulnerability

Published Jul 14, 2026 · Updated Nov 10, 2026 · Assigned by microsoft

Vendor: Microsoft Product: Windows 10 Version 21H2 Product: Windows 10 Version 22H2 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

Access of resource using incompatible type ('type confusion') in Composite Image File System Driver allows an authorized attacker to disclose information locally.

Affected products

Vendor	Product	Affected	Fixed
Microsoft	Windows 10 Version 21H2	10.0.19044.0 – < 10.0.19044.7548	10.0.19044.7548
Microsoft	Windows 10 Version 22H2	10.0.19045.0 – < 10.0.19045.7548	10.0.19045.7548
Microsoft	Windows 11 Version 24H2	10.0.26100.0 – < 10.0.26100.8875	10.0.26100.8875
Microsoft	Windows 11 Version 25H2	10.0.26200.0 – < 10.0.26200.8875	10.0.26200.8875
Microsoft	Windows 11 version 26H1	10.0.28000.0 – < 10.0.28000.2525	10.0.28000.2525
Microsoft	Windows Server 2022	10.0.20348.0 – < 10.0.20348.5386	10.0.20348.5386
Microsoft	Windows Server 2025	10.0.26100.0 – < 10.0.26100.33158	10.0.26100.33158
Microsoft	Windows Server 2025 (Server Core installation)	10.0.26100.0 – < 10.0.26100.33158	10.0.26100.33158

Advisories 3

WID-SEC-2026-2316 Microsoft Windows Produkte: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 6, 2026
NCSC-2026-0231 Kwetsbaarheden verholpen in Microsoft Windows NCSC-NL (Netherlands) · Jul 14, 2026
MSRC-CVE-2026-50381 Composite Image File System driver (cimfs.sys) Information Disclosure Vulnerability Microsoft Security Response Center · Jul 14, 2026

References

Composite Image File System driver (cimfs.sys) Information Disclosure Vulnerability vendor-advisory patch