What potential security risks are associated with using $_SERVER['PHP_SELF'] in PHP scripts?

Using $_SERVER['PHP_SELF'] in PHP scripts can pose a security risk as it can make your application vulnerable to cross-site scripting (XSS) attacks. To mitigate this risk, it is recommended to use htmlspecialchars() function to sanitize the output of $_SERVER['PHP_SELF'] before displaying it to the user.

$php_self = htmlspecialchars($_SERVER['PHP_SELF']);
echo $php_self;