Microsoft's nemesis returns: Nightmare Eclipse is back with a new zero day which could be bad news for Windows users
This is the tenth zero-day the disgruntled researcher disclosed, and yet another released soon after a Patch Tuesday.
Microsoft faces a renewed threat as the notorious zero-day researcher, Nightmare Eclipse, has returned with a new exploit called ShieldBreak. This flaw, which bypasses a recent patch, poses a significant risk to Windows users, particularly those using the latest versions of Windows 11. Nightmare Eclipse has a history of targeting Microsoft, starting with BlueHammer in April 2026, and releasing a string of vulnerabilities and exploits, including RedSun, UnDefend, YellowKey, GreenPlasma, MiniPlasma, RoguePlanet, GreatXML, and LegacyHive.
Despite Microsoft's response to the reported vulnerability, they have not yet patched ShieldBreak, leaving Windows systems vulnerable. Security researcher Kevin Beaumont confirmed that ShieldBreak is functional on the latest Windows 11, making it a significant concern for users and highlighting the ongoing issue of unpatched vulnerabilities.
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