First reported by BleepingComputer
Microsoft patches RoguePlanet Defender zero-day vulnerability
Microsoft Patches RoguePlanet Defender Flaw That Can Grant SYSTEM Privileges
From the article
Microsoft has released security updates for a Defender vulnerability known as RoguePlanet, nearly a month after details of the flaw became public. The vulnerability, tracked as CVE-2026-50656 (CVSS score: 7.8), is a privilege escalation issue in the Microsoft Malware Protection Engine ("mpengine.dll"), which provides scanning, detection, and cleaning capabilities for its antivirus and
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