#VU121252 Information disclosure in Windows and Windows Server - CVE-2026-20821
Published: January 13, 2026
Vulnerability identifier: #VU121252
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-20821
CWE-ID: CWE-200
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Windows
Windows Server
Windows
Windows Server
Software vendor:
Microsoft
Microsoft
Description
The vulnerability allows a local attacker to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the application in Remote Procedure Call. A local attacker can gain unauthorized access to sensitive information on the system.
Remediation
Install updates from vendor's website.