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Zero-dayJul 9, 2026

Microsoft Reins in RoguePlanet Zero-Day Threat

Researcher 'Nightmare-Eclipse' releases PoC for Windows Defender zero-day.

Summary

A researcher identified as 'Nightmare-Eclipse' has released a proof-of-concept exploit for a previously unknown zero-day vulnerability affecting Windows Defender. This follows the researcher's pattern of disclosing multiple Microsoft zero-days in early June.

Indicators of Compromise

  • malware — RoguePlanet

Entities

Windows Defender (product)Microsoft (vendor)Nightmare-Eclipse (threat_actor)