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

Using the PHP_SELF variable 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 sanitize the input and validate the form action URL before using it. 

```php
$formAction = htmlspecialchars($_SERVER["PHP_SELF"], ENT_QUOTES, 'UTF-8');
```
This code snippet uses the htmlspecialchars function to sanitize the PHP_SELF variable before using it in the form action attribute.

Keywords

security risks PHP_SELF variable form actions cross-site scripting injection vulnerabilities

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