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Microsoft released a critical security update on July 9, 2026, to address the "RoguePlanet" vulnerability (CVE--2026--50656) within the Microsoft Malware Protection Engine. The flaw, which permitted local privilege escalation to SYSTEM--level on Windows 10 and 11, had been publicly disclosed on June 10. While the company reported no evidence of active exploitation, the 30--day window between disclosure and the patch release has prompted scrutiny from enterprise clients regarding Microsoft's response agility for core security components.