What are the potential security risks associated with using `$_SERVER['PHP_SELF']` in form actions in PHP?

Using `$_SERVER['PHP_SELF']` in form actions can expose your application to potential security risks like Cross-Site Scripting (XSS) attacks and form spoofing. To mitigate these risks, it is recommended to use `htmlspecialchars()` function to sanitize the value before using it in the form action attribute. 

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

Keywords

$_SERVER['PHP_SELF'] form actions security risks PHP

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