Question: Consider a carelessly written web application for an online-shopping site, which stores the price of each item as a hidden form variable in the web

Consider a carelessly written web application for an online-shopping site, which stores the price of each item as a hidden form variable in the web page sent to the customer; when the customer submits the form, the information from the hidden form variable is used to compute the bill for the customer. What is the loophole in this scheme?

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