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Cloud Sync Root RegistrationShieldBreak: Hunting Windows Defender Remediation Abuse and Cloud Files Hijacking

August 19, 2026 · LevelBlue SpiderLabs · Severity: LOW

Following GreenPlasma, YellowKey and MiniPlasma, RoguePlanet and GreatXML , and LegacyHive , the Nightmare-Eclipse disclosure actor has published ShieldBreak — its latest Windows proof of concept (PoC) released shortly after Microsoft's August 2026 Patch Tuesday.

Following GreenPlasma, YellowKey and MiniPlasma, RoguePlanet and GreatXML, and LegacyHive, the Nightmare-Eclipse disclosure actor has published ShieldBreak — its latest Windows proof of concept (PoC) released shortly after Microsoft's August 2026 Patch Tuesday.

Key Takeaways

  • LevelBlue uncovers Cloud Sync Root RegistrationShieldBreak, a technique for abusing Windows Defender remediation for privilege escalation.
  • Organizations should review the full article for complete details and implement relevant security measures.
  • Organizations should review the full article for complete details and implement relevant security measures.
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