CVE-2026-20838 - Vulnerability Details - OpenCVE

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

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Vendors	Products
Microsoft	Windows 11 23h2 Windows 11 24h2 Windows 11 25h2 Windows Server 2022 Windows Server 2025 Windows Server 23h2

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References

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

History

Tue, 13 Jan 2026 18:15:00 +0000

Type	Values Removed	Values Added
Description		Generation of error message containing sensitive information in Windows Kernel allows an authorized attacker to disclose information locally.
Title		Windows Kernel Information Disclosure Vulnerability
First Time appeared		Microsoft Microsoft windows 11 23h2 Microsoft windows 11 24h2 Microsoft windows 11 25h2 Microsoft windows Server 2022 Microsoft windows Server 2025 Microsoft windows Server 23h2
Weaknesses		CWE-209
CPEs		cpe:2.3:o:microsoft:windows_11_23H2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_23H2:::::::x64:* cpe:2.3:o:microsoft:windows_11_24H2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_25H2:::::::arm64:* cpe:2.3:o:microsoft:windows_server_2022:::::::: cpe:2.3:o:microsoft:windows_server_2025:::::::: cpe:2.3:o:microsoft:windows_server_23h2::::::::
Vendors & Products		Microsoft Microsoft windows 11 23h2 Microsoft windows 11 24h2 Microsoft windows 11 25h2 Microsoft windows Server 2022 Microsoft windows Server 2025 Microsoft windows Server 23h2
References		https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20838
Metrics		cvssV3_1 `{'score': 5.5, 'vector': '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'}`

MITRE

Status: PUBLISHED

Assigner: microsoft

Published: 2026-01-13T17:56:25.953Z

Updated: 2026-01-13T18:04:12.055Z

Reserved: 2025-12-03T05:54:20.376Z

Link: CVE-2026-20838

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-01-13T18:16:12.153

Modified: 2026-01-13T18:16:12.153

Link: CVE-2026-20838

Redhat

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OpenCVE Enrichment

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