CVE-2026-20818: Windows Kernel Information Disclosure Vulnerability
This Microsoft advisory covers CVE-2026-20818 in Windows Server 2016 (Server Core installation), Windows Server 2019 (Server Core installation) and Windows Server 2022, 23H2 Edition (Server Core installation).
- CVE-2026-20818
Key facts
- Vendor rating
- Medium, CVSS 6.2
- CISA KEV
- Not listed (catalogue checked )
- Affected
- 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 and 5 more below
- Fixed in
- 10.0.14393.8783, 10.0.17763.8276, 10.0.20348.4648 and 2 more below
- Source published
- Source revised
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
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).
Text from the source record.
- 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 ·verify at source
How to fix CVE-2026-20818
Upgrade to a fixed release named by Microsoft:
- 10.0.14393.8783
- 10.0.17763.8276
- 10.0.20348.4648
- 10.0.25398.2092
- 10.0.26100.32230
End-of-life dates for Windows Server
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