The Microsoft Malware Protection Engine is a core security component developed by Microsoft that provides scanning, detection, and cleaning capabilities for various antivirus and antispyware software. It is primarily used to protect systems by performing real-time and scheduled scans to identify and remove malware, spyware, and other malicious threats. The engine powers several Microsoft security solutions, including Microsoft Defender Antivirus and Microsoft Endpoint Protection.

Microsoft Malware Protection Engine

Microsoft is aware of an elevation of privilege in the Microsoft Malware Protection Engine in Microsoft Defender publicly referred to as &quot;RoguePlanet &quot;.

CVE ID	Severity	Score	Technologies	Component name	CISA KEV exploit	Has fix	Published date
CVE-2026-45584	HIGH	8.1	Microsoft Malware Protection Engine	cpe:2.3:a:microsoft:malware_protection_engine	No	Yes	May 20, 2026
CVE-2026-55012	HIGH	7.8	Microsoft Malware Protection Engine	cpe:2.3:a:microsoft:malware_protection_engine	No	Yes	Jul 14, 2026
CVE-2026-55011	HIGH	7.8	Microsoft Malware Protection Engine	cpe:2.3:a:microsoft:malware_protection_engine	No	Yes	Jul 14, 2026
CVE-2026-41091	HIGH	7.8	Microsoft Defender Antimalware Platform	cpe:2.3:a:microsoft:defender_antimalware_platform	Yes	Yes	May 20, 2026
CVE-2026-50656	HIGH	7	Microsoft Malware Protection Engine	cpe:2.3:a:microsoft:malware_protection_engine	No	Yes	Jun 16, 2026

CVE-2026-50656:
Microsoft Malware Protection Engine vulnerability analysis and mitigation

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CVE-2026-50656: Microsoft Malware Protection Engine vulnerability analysis and mitigation