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Zero-dayApr 9, 2026

'BlueHammer' Windows Zero-Day Exploit Signals Microsoft Bug Disclosure Issues

Researcher releases PoC exploit for Windows zero-day under 'Chaotic Eclipse' alias.

Summary

A security researcher operating under the alias 'Chaotic Eclipse' has publicly released a proof-of-concept exploit for a Windows zero-day vulnerability that enables local privilege escalation and system takeover. The researcher cited an undisclosed dispute with Microsoft as motivation for the disclosure. The 'BlueHammer' exploit highlights ongoing tensions around Microsoft's vulnerability disclosure practices and responsible reporting timelines.

Indicators of Compromise

  • malware — BlueHammer

Entities

Windows (product)Microsoft (vendor)Chaotic Eclipse (threat_actor)BlueHammer (campaign)