Ну просто охуительный езычок. И теперь хочешь не хочешь надо учить это говнецо, тыжпрограммист.
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To fix, there are several changes you can make. Any one of these changes will prevent currently possible attacks, but if you add several layers of protection (“defense in depth”) you protect against the possibility that you get one of the protections wrong and also against future browser vulnerabilities. First, use an XSRF token as discussed earlier to make sure that JSON results containing confidential data are only returned to your own pages. Second, your JSON response pages should only support POSTrequests, which prevents the script from being loaded via a script tag. Third, you should make sure that the script is not executable. The standard way of doing this is to append some non-executable prefix to it, like ])}while(1);</x>. A script running in the same domain can read the contents of the response and strip out the prefix, but scripts running in other domains can't.