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POPaypal Security Flaw?
 

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  1. POPaypal Security Flaw?
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    <p>I have a the following form at the end of a booking process (simplified):</p> <pre><code>&lt;form action="https://www.paypal.com/cgi-bin/webscr" name="paypalForm" method="post"&gt; &lt;input type="hidden" name="amount" value="&lt;?=$price;?&gt;"&gt; &lt;input type="hidden" name="business" value="business@email.co.uk"&gt; &lt;input type="hidden" name="notify_url" value="http://website.co.uk/ipn"&gt; &lt;/form&gt; </code></pre> <p>I have only left out things like address name etc. So when they pay via Paypal, I am using paypal IPN to mark them in the database as paid. <em>However</em>..</p> <p>I have gone to the end of my booking system and viewed source of the webpage, modified the business email address and amount. I haven't tried a full transaction yet, but surely with the 'notify_url' in there Paypal with send an IPN message to my server and will mark the person off as paid? Isn't this terrible security? Surely this not how all paypal payments work, I must be missing something.</p> <p>There are two things I can think of that might prevent this:</p> <ol> <li>If I remove the "notify_url", will the IPN URL that I have set <em>in</em> paypal work instead? What value does paypal place on the hidden var <code>notify_url</code>, does it override the settings in the back end of paypal?</li> <li>In my IPN code I could check for business and Amount. I don't currently, as I didn't read any where in the documentation that I should. But now, I am thinking that maybe it would be a terribly good idea.</li> </ol>
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