Summary
Security researcher Nightmare Eclipse released LegacyHive, an unpatched Windows zero-day exploit that allows local privilege escalation by abusing the Windows User Profile Service to load arbitrary registry hives. The flaw affects all fully patched Windows versions as of July 2026 and currently there is no official security update from Microsoft.
Take Action:
Even if you have applied the latest July 2026 patches, your Windows systems remain vulnerable to this local privilege escalation exploit. Monitor for unusual registry mounting activity and restrict standard user permissions to prevent attackers from accessing administrator-level data.
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This article was originally published on BeyondMachines
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