What are some common security vulnerabilities associated with form processing in PHP and how can they be mitigated?

One common security vulnerability associated with form processing in PHP is Cross-Site Scripting (XSS), where malicious scripts are injected into the form fields. This can be mitigated by sanitizing user input before processing it. 

// Mitigating XSS vulnerability by sanitizing user input
$user_input = $_POST['user_input'];
$clean_input = htmlspecialchars($user_input, ENT_QUOTES, 'UTF-8');

Keywords

SQL injection Cross-site scripting (XSS) CSRF protection validation functions prepared statements

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