Medium6.2Microsoft Server

Medium [CVE-2026-20818] 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).

CVE-2026-20818 Published Jan 13, 2026Updated by vendor Jul 30, 2026

CVE-2026-20818

Affected products & platforms

Microsoft ServerWindows Server

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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).

Affected versions

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 months ago·verify at source

Fixed versions

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 months 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 months ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Official vendor advisoryofficial
Official advisory page fetched and parsed for the summary, affected/fixed versions and remediation guidance it provides.
Microsoft Server
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2026-20818 instead of the raw feed document.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-20818NVD CVE.org MITRE

Official resources

MSRC Security Update Guide
Official documentation
Filter by this CVE for per-product KB numbers, severity and exploitability assessment.

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