Input validation issue in EC-CUBE Payment Module (2.12) version 3.5.23 and earlier, EC-CUBE Payment Module (2.11) version 2.3.17 and earlier, GMO-PG Payment Module (PG Multi-Payment Service) (2.12) version 3.5.23 and earlier, GMO-PG Payment Module (PG Multi-Payment Service) (2.11) version 2.3.17 and earlier allows an attacker with administrative rights to execute arbitrary PHP code on the server via unspecified vectors.