What are the potential security risks 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. This is because PHP_SELF reflects the current script file in the URL, making it vulnerable to manipulation by malicious users. 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 fields go here -->
</form>

Keywords

PHP_SELF form actions security risks vulnerabilities cross-site scripting

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