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vulnerabilityhighLocal Privilege EscalationZero-Day ExploitChaotic Eclipse

Apr 09, 2026 • Elizabeth Montalbano

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

A security researcher operating under the alias 'Chaotic Eclipse' has published a proof-of-concept exploit targeting a zero-day vulnerability in Windows,...

Source
Dark Reading
Category
vulnerability
Severity
high

Executive Summary

A security researcher operating under the alias 'Chaotic Eclipse' has published a proof-of-concept exploit targeting a zero-day vulnerability in Windows, dubbed 'BlueHammer.' The flaw enables local privilege escalation, potentially allowing an attacker to achieve full system takeover. The researcher cites personal motivation stemming from a dispute with Microsoft regarding vulnerability disclosure. While no active exploitation has been confirmed, the public release of the PoC significantly lowers the barrier for malicious actors to develop working exploits. Organizations should apply patches immediately upon release, monitor for unusual privilege escalation attempts, and restrict local user permissions where possible. Microsoft is expected to issue an official patch addressing this vulnerability.

Summary

Under the alias 'Chaotic Eclipse,' a researcher released a PoC exploit for a zero-day flaw that allows for system takeover by a local user, citing an undisclosed beef with Microsoft.

Published Analysis

A security researcher operating under the alias 'Chaotic Eclipse' has published a proof-of-concept exploit targeting a zero-day vulnerability in Windows, dubbed 'BlueHammer.' The flaw enables local privilege escalation, potentially allowing an attacker to achieve full system takeover. The researcher cites personal motivation stemming from a dispute with Microsoft regarding vulnerability disclosure. While no active exploitation has been confirmed, the public release of the PoC significantly lowers the barrier for malicious actors to develop working exploits. Organizations should apply patches immediately upon release, monitor for unusual privilege escalation attempts, and restrict local user permissions where possible. Microsoft is expected to issue an official patch addressing this vulnerability. Under the alias 'Chaotic Eclipse,' a researcher released a PoC exploit for a zero-day flaw that allows for system takeover by a local user, citing an undisclosed beef with Microsoft. Under the alias 'Chaotic Eclipse,' a researcher released a PoC exploit for a zero-day flaw that allows for system takeover by a local user, citing an undisclosed beef with Microsoft.

Linked Entities

  • Chaotic Eclipse