#VU121230 Information disclosure in Windows and Windows Server - CVE-2026-20805
Published: January 13, 2026
Vulnerability identifier: #VU121230
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:A/U:Amber
CVE-ID: CVE-2026-20805
CWE-ID: CWE-200
Exploitation vector: Local access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerable software:
Windows
Windows Server
Windows
Windows Server
Software vendor:
Microsoft
Microsoft
Description
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the Desktop Windows Manager. A local user can gain access to a section address from a remote ALPC port, which is user-mode memory.
Note, the vulnerability is being actively exploited in the wild.
Remediation
Install updates from vendor's website.