Within my web application, there are several pages that handle submitted data from forms. I would like to prevent the following scenario:
A user creates a form on the client side with identical fields to my original form and sends it to the URL responsible for processing forms. Subsequently, my processing page receives the user-submitted form and processes it.
Is there a method to ensure that only forms sent through my web application are processed?
A simple method involves creating a unique token, storing it in a session variable during form generation, and including it as a hidden field in the form.
Upon form submission, you can verify the session variable against the form field value.
This approach ensures that visitors must request the form first, although they could potentially obtain the token programmatically and inject it into the form submission.
Are the users not logged in?
If you're interested, you may want to explore information on Cross-Site Request Forgery (CSRF). There are a variety of resources available that provide detailed explanations and guides on how to approach this topic, such as the following:
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