Windows Kernel Information Disclosure Vulnerability (Microsoft Windows 11 version 23H2)

CVE-2026-20838

MEDIUM 5.5

At a glance

Source: NVD
EPSS: EPSS 0.65 % · percentile 51 (2026-11-01)
State: PUBLISHED
Published: 2026-01-13 17:56 UTC
Updated: 2026-07-30 20:46 UTC
Assigner: microsoft
NVD status: Analyzed

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Description

Generation of error message containing sensitive information in Windows Kernel allows an authorized attacker to disclose information locally.

Weaknesses (CWE)

CWE-209 — Generation of Error Message Containing Sensitive Information

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20838

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C	microsoft
CVSS 3.1	MEDIUM 5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	NVD · secure@microsoft.com (Secondary)

European references

ENISA EUVD · EUVD-2026-2176
GCVE · GCVE-0-2026-20838

CERT-FR advisories

CERTFR-2026-AVI-0044 — Multiples vulnérabilités dans Microsoft Windows · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:* < 10.0.22631.6491
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:* < 10.0.26100.7623
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:* < 10.0.26200.7623
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* < 10.0.20348.4648
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:* < 10.0.25398.2092
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:* < 10.0.26100.32230

Affected products

Product	Versions
Microsoft · Windows 11 version 23H2	affected 10.0.22631.0 < 10.0.22631.6491
Microsoft · Windows 11 Version 23H2	affected 10.0.22631.0 < 10.0.22631.6491
Microsoft · Windows 11 Version 24H2	affected 10.0.26100.0 < 10.0.26100.7623
Microsoft · Windows 11 Version 25H2	affected 10.0.26200.0 < 10.0.26200.7623
Microsoft · Windows Server 2022	affected 10.0.20348.0 < 10.0.20348.4648
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)	affected 10.0.25398.0 < 10.0.25398.2092
Microsoft · Windows Server 2025	affected 10.0.26100.0 < 10.0.26100.32230
Microsoft · Windows Server 2025 (Server Core installation)	affected 10.0.26100.0 < 10.0.26100.32230

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD