Threat Summary A critical zero-day vulnerability (CVE-2026-50656/“RoguePlanet”) in Microsoft Defender’s Malware Protection Engine (mpengine.dll) enables local users, including standard, low-privilege accounts, to escalate privileges to NT AUTHORITY\SYSTEM using a race condition and improper link resolution. Microsoft initially issued a patch (Engine v1.1.26060.3008) in July 2026. However, on August 12, 2026, a new exploit chain, “ShieldBreak,” … Microsoft Defender Patch Bypass: High Severity Zero-Day Privilege Escalation (CVE-2026-50656/RoguePlanet, ShieldBreak)
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