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How did user bypass select option in my site's item entry?

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A php freak came into my site and did some testing for me and entered an item without a category, categories are 1 or greater than 1 and he entered a category of 0.


I have since placed a query in the code to check the values of the categories entered but I was wondering how he did it, so I ask the question in the title.

How did a user bypass the select option?


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all external data can be anything that someone or a bot script chooses to submit, cannot be trusted, and must be validated to insure it is an expected value or within an expected range of values.


someone or a bot script doesn't need your form at all in order to submit data to your form processing code.

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