Microsoft working on patch for RoguePlanet Defender zero-day (CVE-2026-50656)

**RoguePlanet (CVE-2026-50656)**: A publicly released proof-of-concept by a researcher known as Nightmare Eclipse abuses a race condition in Microsoft Defender to achieve SYSTEM-level local privilege escalation on fully patched Windows 10/11 systems. Microsoft has acknowledged the issue, labeled it as "Exploitation More Likely", is preparing a security update, and reports no confirmed in-the-wild exploitation to date; the PoC may be unreliable due to timing/race conditions but works in tests and can bypass typical signature mitigations.