Information disclosure in Microsoft Windows_11_23h2
CVE-2026-20838
Generation of error message containing sensitive information in Windows Kernel allows an authorized attacker to disclose information locally.
EPSS: 0.006 (45.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Microsoft Windows_11_23h2
- Microsoft Windows_11_24h2
- Microsoft Windows_11_25h2
- Microsoft Windows 11 Version 22h3 — versions 10.0.22631.0
- Microsoft Windows 11 Version 23h2 — versions 10.0.22631.0
- Microsoft Windows 11 Version 24h2 — versions 10.0.26100.0
- Microsoft Windows 11 Version 25h2 — versions 10.0.26200.0
- Microsoft Windows Server 2022 — versions 10.0.20348.0
- Microsoft Windows_server_2022
- Microsoft Windows_server_2022_23h2
Weakness classification (CWE)
References
- secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-20838?
- CVE-2026-20838 is a medium-severity vulnerability in Microsoft Windows_11_23h2, classified under Generation of Error Message Containing Sensitive Information. CVSS score: 5.5/10. Published 2026-01-13.
- How severe is CVE-2026-20838?
- Medium severity. CVSS v3 base score is 5.5 out of 10.