A security researcher has published details of what appears to be a zero-day privilege escalation exploit in CrowdStrike. The individual, identified by their online moniker “Nightmare Eclipse” (aka Infinite Nightmare, MSNightmare) posted the details to GitHub on September 3. “FalconFlank is a zero-day privilege escalation that abuses the Office malicious macros remediation in CrowdStrike Falcon Sensor. Obviously by the time I drop this CrowdStrike would already have detections for it so if you want to test you either have to add it to the exclusions or obfuscate the PoC and change the dll load technique,” they wrote. “As of now it works in a fully updated Windows 11 25H2 / Windows Server 2025 with CrowdStrike Falcon – Phase 3 Optimal Protection + needs ‘Microsoft Office file malicious…