Microsoft experienced one of its most intense patch Tuesdays in June 2026, addressing over 200 vulnerabilities. Despite these efforts, a new zero-day vulnerability named RoguePlanet has emerged in Microsoft Defender, reportedly allowing SYSTEM privileges on fully updated systems. The company set a record by publishing patches for 208 CVEs, and the total for June reaches 571 when including third-party issues.
Is Microsoft Defender’s new zero-day vulnerability a major threat?
