Critical Elevation of Privilege Vulnerability (CVE-2026-69414) Discovered in Microsoft Defender's Malware Protection Engine

A critical elevation of privilege flaw, publicly referred to as 'ShieldBreak,' has been identified in the Microsoft Malware Protection Engine within Microsoft Defender. This vulnerability, CVE-2026-69414, allows attackers to escalate privileges from standard user to system-level administrative access by exploiting improper validation and handling of specially crafted malware samples during the scanning process. The operational impact includes the potential for persistent backdoor installation, system file modification, and data theft.