Windows Kernel Information Disclosure Vulnerability
This medium-severity Microsoft Server advisory covers CVE-2026-20818 affecting Windows Server 2016 (Server Core installation), Windows Server 2019 (Server Core installation), Windows Server 2022, 23H2 Edition (Server Core installation).
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Summary
Insertion of sensitive information into log file in Windows Kernel allows an unauthorized attacker to disclose information locally.
Affected products named by the advisory: Windows Server 2016; Windows Server 2016 (Server Core installation); Windows Server 2019; Windows Server 2019 (Server Core installation); and 4 more.
Affected products named by the advisory: Windows Server 2022, 23H2 Edition (Server Core installation); Windows Server 2025 (Server Core installation).
- Windows Server 2016 10.0.14393.0 before 10.0.14393.8783
- Windows Server 2016 (Server Core installation) 10.0.14393.0 before 10.0.14393.8783
- Windows Server 2019 10.0.17763.0 before 10.0.17763.8276
- Windows Server 2019 (Server Core installation) 10.0.17763.0 before 10.0.17763.8276
- Windows Server 2022 10.0.20348.0 before 10.0.20348.4648
- Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 before 10.0.25398.2092
- Windows Server 2025 10.0.26100.0 before 10.0.26100.32230
- Windows Server 2025 (Server Core installation) 10.0.26100.0 before 10.0.26100.32230
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
- 10.0.14393.8783
- 10.0.17763.8276
- 10.0.20348.4648
- 10.0.25398.2092
- 10.0.26100.32230
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation
Upgrade to a fixed release: 10.0.14393.8783, 10.0.17763.8276, 10.0.20348.4648, 10.0.25398.2092, 10.0.26100.32230. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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