Improper Input Validation
In Shopizer before version 2.11.0, using API or Controller based versions negative quantity is not adequately validated hence creating incorrect shopping cart and order total. This vulnerability makes it possible to create a negative total in the shopping cart. This has been patched in version 2.11.0.
CWE-20 - Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.