Microsoft Patches Windows Zero-Day Tied to 'Nightmare Eclipse' Researcher
A newly disclosed Windows privilege-escalation flaw, called LegacyHive or ShieldBreak, appears to have been addressed in Microsoft's July 2026 update round.
AfroEuropa Newsroom
AfroEuropa desk
Microsoft has issued security fixes for a Windows zero-day vulnerability that surfaced shortly after its July 2026 Patch Tuesday, according to BleepingComputer, which identified the flaw as "LegacyHive."
The same underlying issue is described by Tom's Hardware under the name "ShieldBreak," published by a researcher known as "Nightmare Eclipse." According to that report, the exploit is designed to grant SYSTEM-level privileges — a level higher than Administrator — to an attacker who runs code as an ordinary user. The proof-of-concept is intended to open an elevated command prompt with those privileges.
Tom's Hardware reported that the researcher presents ShieldBreak as a continuation of an earlier flaw called RoguePlanet in Windows Defender's subsystems, claiming Microsoft did not fully fix the original issue and that the new technique bypasses recently added protections.
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