What potential security risks are associated with using PHP_SELF in form actions?

Using PHP_SELF in form actions can expose your application to potential security risks such as cross-site scripting (XSS) attacks. To mitigate this risk, it is recommended to use htmlspecialchars() function to sanitize the PHP_SELF variable before using it in form actions. 

<form action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']); ?>" method="post">
  <!-- form inputs here -->
</form>

Keywords

PHP_SELF form actions security risks cross-site scripting user input validation

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