Type Confusion in Windows and Windows Server - CVE-2026-50381
Published: July 17, 2026
Vulnerability identifier: #VU137991
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-50381
CWE-ID: CWE-843
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Windows
Windows Server
Windows
Windows Server
Detailed vulnerability description
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to type confusion in Composite Image File System Driver (cimfs.sys) when accessing a resource using an incompatible type. A local user can trigger the flaw to disclose sensitive information.
The disclosed information is limited to file metadata.
How to mitigate CVE-2026-50381
Install security update from vendor's website.