CVE-2026-20818

Windows Kernel Information Disclosure Vulnerability

CVE-2026-20818 is fixed in 9 products on 1 platform, first by KB5073722, released January 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

6.2

Important

Exploitation

None reported

Exploitation Unlikely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0071

53rd percentile

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

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows Server 2016	14393.8783	KB5073722	Jan 13, 2026
Windows Server 2016 (Server Core installation)	14393.8783	KB5073722	Jan 13, 2026
Windows Server 2019	17763.8276	KB5073723	Jan 13, 2026
Windows Server 2019 (Server Core installation)	17763.8276	KB5073723	Jan 13, 2026
Windows Server 2022	20348.4648	KB5073457	Jan 13, 2026
Windows Server 2022 (Server Core installation)	20348.4648	KB5073457	Jan 13, 2026
Windows Server 2022, 23H2 Edition (Server Core installation)	25398.2092	KB5073450	Jan 13, 2026
Windows Server 2025	26100.32230	KB5073379	Jan 13, 2026
Windows Server 2025 (Server Core installation)	26100.32230	KB5073379	Jan 13, 2026

Details

Published
January 13, 2026
Weakness
Insertion of Sensitive Information into Log File
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20818

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