Microsoft nemesis returns with another zero-day PoC — but is 'LegacyHive' as nasty as expected?

A laptop with the Windows 11 desktop on screen, glowing, while on a work desk .

• Researcher “Chaotic Eclipse” releases new Windows 11 zero‑day dubbed LegacyHive , a local privilege escalation bug targeting user registry hives
• Exploit could let attackers elevate low‑privileged accounts, but requires prior device access; no CVE or full PoC was published
• Experts caution that skilled actors could weaponize it quickly, urging intelligence teams to prepare mitigations despite lower perceived impact than earlier releases

Chaotic Eclipse, the infamous security researcher with a Microsoft grudge, did as they previously promised and released yet another zero-day vulnerability for fully patched Windows 11 devices.