⚠️ CRITICAL: Hackers target US firms in FastJson RCE zero-day attacks A critical RCE zero-day (CVE-2026-16723) in FastJson Java library versions 1.2.68-1.2.83 is actively exploited against U.S. firms across multiple sectors. Attackers can execute arbitrary code without user interaction. FastJson 1.x is unmaintained, leaving affected systems without patches. https://threatnoir.com/focus #infosec #cybersecurity