Electronic Delivery Check System (Doboku) Ver.18.1.0 and earlier, Electronic Delivery Check System (Dentsu) Ver.12.1.0 and earlier, Electronic Delivery Check System (Kikai) Ver.10.1.0 and earlier, and Electronic delivery item Inspection Support SystemVer.4.0.31 and earlier improperly restrict XML external entity references (XXE). By processing a specially crafted XML file, arbitrary files on the system may be read by an attacker.
https://www.ysk.nilim.go.jp/cals/