CVE-2026-69528: CWE-306: Missing Authentication for Critical Function in Microsoft Windows 11 version 23H2

This vulnerability (CVE-2026-69528) involves a missing authentication for a critical function within the Windows Shell component of Microsoft Windows 11 version 23H2. An authorized local attacker can exploit this flaw to elevate their privileges on the affected system. The vulnerability is rated high severity with a CVSS 3.1 base score of 7.8, reflecting local attack vector with low complexity, no user interaction, and high impact on confidentiality, integrity, and availability. Multiple affected Windows 11 builds are identified, and Microsoft has released an official fix to address the issue.

An authorized local attacker can leverage this vulnerability to gain elevated privileges, potentially leading to full system compromise. The impact includes complete confidentiality, integrity, and availability loss on the affected system. There are no known exploits in the wild at this time.

Microsoft has released an official fix for this vulnerability. Users and administrators should apply the latest security updates for Windows 11 version 23H2 as provided in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69528. No additional mitigation actions are required beyond applying the official patch.