Microsoft patches RoguePlanet zero-day vulnerability in Defender engine

Microsoft has released a critical update for the Microsoft Malware Protection Engine to address a zero-day vulnerability known as RoguePlanet. Tracked as CVE-2026-50656, the flaw resides in the core scanning engine that powers Microsoft Defender across Windows 10, Windows 11, and Windows Server. The fix is delivered through engine version 1.1.26060.3008, which corrects flawed file-handling logic during malware remediation processes. Source

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