CVE-2026-69799: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 10 Version 21H2

This vulnerability (CVE-2026-69799) is a race condition (CWE-362) in the Windows Hello component of Microsoft Windows 10 Version 21H2. It occurs due to improper synchronization when multiple executions access a shared resource concurrently, which can be exploited by an authorized local attacker to elevate privileges. The CVSS 3.1 base score is 7.8, indicating high severity, with attack vector local, high attack complexity, low privileges required, no user interaction, and scope changed. Confidentiality, integrity, and availability impacts are all high. Microsoft has released an official fix for this vulnerability.

An authorized local attacker can exploit this race condition to elevate their privileges on the affected Windows 10 systems. This could lead to full system compromise, including unauthorized access to sensitive data, modification of system settings, and disruption of system availability.

Microsoft has released an official fix for this vulnerability. Users and administrators should apply the security updates provided by Microsoft to affected Windows 10 versions to remediate this issue. No additional mitigation steps are required beyond applying the official patch.