CVE-2026-20849

Microsoft · Published January 13, 2026

7.5

CVSS v3.1

HIGH

Patch availableGet patch

Description

Windows Kerberos Elevation of Privilege Vulnerability. Reliance on untrusted inputs in a security decision in Windows Kerberos allows an authorized attacker to elevate privileges over a network.

Affected Products

Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows Server 2019
Windows Server 2019 (Server Core installation)

CVSS Vector

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