🚨 Microsoft Defender 0-Day Vulnerability “RedSun” Enables Full SYSTEM Access
Source:
cybersecuritynews.com/defend…
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 by the security researcher known as "Chaotic Eclipse" (also referred to as Nightmare-Eclipse on GitHub).
RedSun follows the same exploit tradition but introduces an entirely new and independent attack vector, suggesting that Defender's architectural weaknesses run far deeper than a single isolated flaw.
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