The Foxit PDF Editor/Reader update service loads system libraries from a search path that includes directories writable by low-privileged users. This allows a local attacker to place a malicious DLL in a writable directory, which the update service may load with SYSTEM privileges, resulting in local privilege escalation and arbitrary code execution. The vulnerability is a DLL search-order hijack, where the service loads a malicious DLL instead of a legitimate one. This can lead to full local compromise, persistence, lateral movement, and data exposure, especially on shared workstations, terminal servers, and VDI images.