Microsoft's nemesis returns: Nightmare Eclipse is back with a new zero day which could be bad news for Windows…

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  • Nightmare Eclipse discloses ShieldBreak, a new Windows privilege‑escalation zero‑day
  • Flaw bypasses a recent patch and works on fully updated Windows 11 systems
  • Researcher’s ongoing exploit spree leaves multiple Windows vulnerabilities still unpatched

Nightmare Eclipse has struck again! The notorious zero-day researcher with a Microsoft grudge disclosed its latest vulnerability, and just as in previous instances, they picked their timing and released their research hours after Microsoft published its August Patch Tuesday cumulative update in order to maximize the hurt.

The newest flaw is called ShieldBreak, and is described as a local escalation of privilege vulnerability that allows threat actors to gain SYSTEM-level privileges on vulnerable systems. Speaking of vulnerable systems, the list is rather long because it includes all versions of Windows 11, including those with the latest security patches.

“The PoC was tested in the latest version of windows 11 25h2 (+Canary channel) and windows server 2025, the...

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