Nightmare-Eclipse Strikes Again with 'ShieldCrash' Privilege Escalation Exploit
A security researcher known as Nightmare-Eclipse has released another Windows zero-day exploit, dubbed 'ShieldCrash', which enables privilege escalation and bypasses a fix for a previous Windows exploit.
The latest exploit, released on September 2026, affects all supported Windows versions and is designed to target CVE-2026-69414, also known as ShieldBreak. This flaw was patched by Microsoft in August's Patch Tuesday, but the researcher claims it was not done properly.
Nightmare-Eclipse has been releasing exploits for Windows flaws since April and appears to be targeting a recurring weakness in how these attack paths have been remediated by Microsoft. The researcher wrote on X that the exploit is indeed 'a full privilege escalation, not just an arbitrary file read.'