Untrusted search path vulnerability in CELSYS, Inc CLIP STUDIO series (CLIP STUDIO PAINT (for Windows) EX/PRO/DEBUT Ver.1.7.3 and earlier, CLIP STUDIO ACTION (for Windows) Ver.1.5.5 and earlier, with its timestamp prior to April 25, 2018, 12:11:31, and CLIP STUDIO MODELER (for Windows) Ver.1.6.3 and earlier, with its timestamp prior to April 25, 2018, 17:02:49) allows remote attackers to gain privileges via a Trojan horse DLL in an unspecified directory.