Windows Defender zero-day CVE-2026-50656 — known as RoguePlanet — has been patched by Microsoft 29 days after researcher Nightmare Eclipse published working exploit code granting SYSTEM-level access on fully patched Windows 10 and Windows 11. Update to Microsoft Malware Protection Engine version 1.1.26060.3008 immediately.
Defender Zero-Day Patched 29 Days After Public Exploit Exposed Millions of PCs
