CVE-2026-20818

Published: Jan 13, 2026Modified: Jan 14, 2026

6.2

Vector

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

Exploitability: 2.5 / Impact: 3.6

Source: secure@microsoft.com (Secondary)

Description

Insertion of sensitive information into log file in Windows Kernel allows an unauthorized attacker to disclose information locally.

Affected (5)

Products: Microsoft: Windows Server 2016, Windows Server 2019, Windows Server 2022, Windows Server 2022 23h2, Windows Server 2025

5 products

Windows Server 2016

Windows Server 2019

Windows Server 2022

Windows Server 2022 23h2

Windows Server 2025

Configuration A

5 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows Server 2016	Before 10.0.14393.8783
Microsoft Windows Server 2019	Before 10.0.17763.8276
Microsoft Windows Server 2022	Before 10.0.20348.4648
Microsoft Windows Server 2022 23h2	Before 10.0.25398.2092
Microsoft Windows Server 2025	Before 10.0.26100.7623

Related CWEs

Insertion of Sensitive Information into Log File

Information written to log files can be of a sensitive nature and give valuable guidance to an attacker or expose sensitive user information.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20818

Source: secure@microsoft.com

Vendor Advisory

Timeline

No history available yet.