Serial Microsoft 0-day hunter drops yet another Defender exploit
A bypass of a bypass of a bypass
Zero-day researcher Nightmare Eclipse, aka MSNightmare, published yet another Microsoft Defender proof-of-concept exploit for a zero-day dubbed ShieldCrash, which they claim will allow attackers to bypass the earlier ShieldBreak patch and read files as SYSTEM.
“I might rework this later into a full SYSTEM PoC but for now I'm dropping this skeleton PoC because I'm feeling a bit lazy,” the prolific Microsoft bug hunter and thorn in Redmond's side said in their latest zero-day exploit's README.
As is usual with Nightmare’s zero-day cadence, they published ShieldCrash shortly after Microsoft released its latest Patch Tuesday security updates. According to Nightmare, this exploit works on Windows systems that have already applied the September patches.
ShieldCrash purports to be a bypass of an earlier Defender privilege escalation zero-day, ShieldBreak (CVE-2026-69414), that allowed attackers to bypass another patch for another Nightmare Eclipse zero-day ...
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