CVE-2026-20857

Microsoft · Published January 13, 2026

7.8

CVSS v3.1

HIGH

Patch availableGet patch

Description

Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability. Untrusted pointer dereference in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.

Affected Products

Windows 11 Version 25H2 for ARM64-based Systems
Windows 11 Version 25H2 for x64-based Systems
Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C