Microsoft Patches RoguePlanet Defender Flaw That Can Grant SYSTEM Privileges

Microsoft has issued security updates to address a vulnerability in its Defender, known as RoguePlanet, which was publicly disclosed nearly a month prior. The flaw is a privilege escalation issue affecting the Microsoft Malware Protection Engine, specifically the mpengine.dll component. This component is responsible for scanning, detection, and cleaning capabilities in Microsoft's antivirus. The vulnerability has a CVSS score of 7.8 and is tracked as CVE-2026-50656. It can potentially grant SYSTEM privileges.