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So you all know about the XSS vulnerability but what I cannot understand is
how come injecting a <?php ?> tag doesn't work? eg.:
suppose there is a Stored XSS vulnerability in the index.php of a site why it doesn't work if you did this:
1. close the php tag ?>
2.open a new one <?php
3.inject your php code and close it again

closed as off-topic by rook, Adi, TildalWave, schroeder, Rory Alsop Oct 2 '14 at 15:00

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question does not appear to be about Information security within the scope defined in the help center." – rook, TildalWave, schroeder, Rory Alsop
If this question can be reworded to fit the rules in the help center, please edit the question.

  • 4
    XSS = interpreted on client side. Clients don't deal/understand PHP. To inject dynamic PHP would be possible in very very very specific contexts and XSS are completely unrelated to this – Aki Oct 2 '14 at 2:03
3

Because the index.php file is already being processed. When you attempt to inject a ?> tag into the file, you're actually injecting it into the page that will eventually be sent to the client.

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