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MEDIUM · 5.5

CVE-2026-20838

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

Vulnerability Description

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

CVSS Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE

Affected Products

VendorProductVersions
MicrosoftWindows 11 23H2< 10.0.22631.6491
MicrosoftWindows 11 24H2< 10.0.26100.7623
MicrosoftWindows 11 25H2< 10.0.26200.7623
MicrosoftWindows Server 2022< 10.0.20348.4648
MicrosoftWindows Server 2022 23H2< 10.0.25398.2092
MicrosoftWindows Server 2025< 10.0.26100.32230

Related Weaknesses (CWE)

CWE-209

References

FAQ

What is CVE-2026-20838?

CVE-2026-20838 is a vulnerability with a CVSS score of 5.5 (MEDIUM). Generation of error message containing sensitive information in Windows Kernel allows an authorized attacker to disclose information locally.

How severe is CVE-2026-20838?

CVE-2026-20838 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-20838?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 11 23H2, Microsoft Windows 11 24H2, Microsoft Windows 11 25H2, Microsoft Windows Server 2022, Microsoft Windows Server 2022 23H2.