Microsoft Releases Patch for 'RoguePlanet' Defender Zero-Day Vulnerability (CVE-2026-50656)

Microsoft has released a security patch to address a zero-day vulnerability in Microsoft Defender, tracked as CVE-2026-50656 and dubbed 'RoguePlanet.' The flaw, publicly disclosed by a security researcher, is a race condition affecting fully patched Windows 10 and Windows 11 devices, potentially allowing attackers to gain SYSTEM privileges. The patch was delivered via an update to the Microsoft Malware Protection Engine.