What are some common security risks associated with allowing users to input HTML and JavaScript in a PHP project?

Allowing users to input HTML and JavaScript in a PHP project can lead to security risks such as cross-site scripting (XSS) attacks, where malicious scripts can be executed on other users' browsers. To mitigate this risk, it is important to properly sanitize and validate user input before allowing it to be displayed on the website. 

// Sanitize and validate user input before displaying it
$userInput = $_POST['user_input']; // Assuming user input is received via POST method

// Sanitize the user input to remove any potentially harmful content
$cleanInput = htmlspecialchars($userInput, ENT_QUOTES, 'UTF-8');

echo $cleanInput;

Keywords

Cross-site scripting SQL injection CSRF input validation output escaping

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