Acceptance of extraneous untrusted data with trusted data vulnerability exists in EC-CUBE 4 series. If this vulnerability is exploited, an attacker who obtained the administrative privilege may install an arbitrary PHP package. If the obsolete versions of PHP packages are installed, the product may be affected by some known vulnerabilities.
The product, when processing trusted data, accepts any untrusted data that is also included with the trusted data, treating the untrusted data as if it were trusted.