I am developing a WordPress theme. for the security of it with XSS. here i have two queries:
How to detect theme can be infected with XSS attack? or already infected?
How to prevent it to be infected with XSS?
i know this is related to WordPress and i should post this on WordPress. i did already here but no solution yet.
XSS isn't an infection, it's a type of security vulnerability. You can learn more about preventing XSS vulnerabilities here.
There isn't an easy answer to this question. To determine if a theme is vulnerable to XSS attacks, you need to audit every source file and check every place that output is generated to make sure it's not doing anything dangerous (e.g.
<form action="<?php echo $_SERVER['PHP_SELF']; ?>">
).Always escape output to prevent user-provided data from adding HTML entities, such as
<
,>
, etc. A quick helper method to use here is:Note that this will prevent users from supplying any HTML at all.