What are the potential security risks of allowing users to input HTML tags in a PHP application?

Allowing users to input HTML tags in a PHP application can pose security risks such as cross-site scripting (XSS) attacks. To mitigate this risk, you should sanitize and validate user input before allowing it to be displayed on the website. 

// Sanitize and validate user input before allowing it to be displayed
$user_input = "<script>alert('XSS attack!');</script>";
$sanitized_input = htmlspecialchars($user_input, ENT_QUOTES, 'UTF-8');

echo $sanitized_input;

Keywords

XSS Cross-site scripting Input validation htmlspecialchars htmlentities

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