Just weeks after Microsoft patched a critical hole in Microsoft Defender, a cybersecurity researcher has posted an apparent workaround that provides system-level control to attackers once they gain any level of access. 
The researcher, who goes by the name Nightmare Eclipse, has been engaged in a long-running battle with Microsoft Security. 
As of publication time, neither Microsoft nor Nightmare Eclipse has provided further details we requested.
But the proof of concept (PoC) security workaround, ShieldBreak, described by Nightmare Eclipse in a series of public posts, potentially threatens to be more damaging than earlier workarounds. 
Like other recently reported vulnerabilities, ShieldBre...