A newly disclosed zero-day vulnerability in Microsoft Defender, dubbed “RedSun,” allows an unprivileged user to escalate privileges to full SYSTEM-level access on fully patched Windows 10, Windows 11, and Windows Server 2019 and later systems, and as of now, remains unpatched. RedSun is the second zero-day exploit published within a two-week span in April 2026 […] The post Microsoft Defender 0-Day Vulnerability “RedSun” Enables Full SYSTEM Access appeared first on Cyber Security News.