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If I have an html form commented out using <!-- form -->
Which has some input fields that are not sanitized, can someone use those to do bad queries to the db? For example with firebug, can someone remove <!-- and use those input fields to do something nasty?
Depending on the script handling the form, a person can certainly create a local copy of that form without the comments. Indeed, if they know what the input names and semantics are, they can create their own form altogether. There’s no good way of detecting whether or not a form submission is from your form or something else masquerading as it.