The vulnerability resides in the Composite Image File System driver (cimfs.sys) where a type‑confusion error (CWE‑843) can be triggered by a local user with sufficient privileges. The flaw allows the attacker to read data that the driver should not expose, resulting in accidental disclosure of sensitive information. No remote execution or denial of service capability is described, and the impact is confined to the local system and accounts that can access the driver.

Microsoft Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 Version 26H1, Windows Server 2022, Windows Server 2025, and the Windows Server 2025 Server Core installation are affected.

The CVSS score of 5.5 ranks the issue in the medium security range, while the EPSS score of less than 1% indicates a very low probability of exploitation. The vulnerability is not listed in CISA’s KEV catalog and requires local authorized access, making it a legitimate threat primarily for systems where local accounts can be compromised.