cimfs driver

The cimfs driver tag covers discussion of a Windows security vulnerability affecting Microsoft’s Composite Image File System driver, cimfs.sys. The featured report examines CVE-2026-50381, an information-disclosure flaw attributed to type confusion and mapped to CWE-843. Exploitation requires local access and valid credentials, but could allow an attacker to read sensitive information outside their normal permissions. The issue is addressed by Microsoft’s July 14, 2026 cumulative security updates. Coverage also notes Microsoft’s CVSS 3.1 score of 5.5, classified as Medium severity, providing context for administrators assessing exposure and update priorities.