Microsoft Defender Malware Protection Engine Flaw Enables Elevation of Privilege

Microsoft published a security advisory for an elevation of privilege vulnerability in the Microsoft Malware Protection Engine, tracked as CVE-2026-50656 and described as a Microsoft Defender Elevation of Privilege Vulnerability. The issue affects a core Defender component used for malware scanning and protection, prompting immediate attention from defenders monitoring endpoint security exposure.

The Canadian Centre for Cyber Security issued advisory AV26-607, urging organizations and administrators to review Microsoft’s guidance and apply the necessary updates as they become available. The notice reinforces that enterprises relying on Microsoft Defender should validate patch deployment and ensure affected systems receive the vendor’s remediation for CVE-2026-50656.