During a web assessment you notice the shopping cart page relies on JavaScript to enforce a maximum purchase quantity of 5 items. When the form is submitted, your interception proxy shows the request body as product_id=7743&qty=5&price=49.99. You want to order 500 items without triggering the browser's client-side check so that the server processes the larger quantity. Which approach is most reliable for bypassing this client-side control?
Disable JavaScript in the browser and refresh the page before submitting the form.
Alter the user-agent header so the site thinks you are using a mobile browser that lacks the quantity limit.
Intercept the POST request with a proxy, change the qty parameter to 500, then forward it to the server.
Use browser developer tools to edit the DOM after clicking Submit but before the response is received.
Client-side validation happens in the user's browser and can be altered or skipped entirely. By pausing the request with an interception proxy such as Burp Suite, modifying the qty parameter to 500, and then forwarding the altered request, the validation logic running in JavaScript is bypassed. The server will receive the tampered value unless it performs its own server-side validation. Disabling JavaScript may allow form submission but often breaks required functionality and can still be caught by server checks. Changing browser user-agent strings or using developer tools after submission does not affect the data already sent over the wire. Clearing cookies only removes stored state and does not override quantity limits enforced in the request payload.
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