What are potential security risks associated with allowing HTML and PHP execution on a forum board?

Allowing HTML and PHP execution on a forum board can pose significant security risks, such as cross-site scripting (XSS) attacks, SQL injection vulnerabilities, and potential server-side exploits. To mitigate these risks, it is recommended to disable PHP execution within user-generated content and properly sanitize and validate any HTML input to prevent malicious code injection. 

// Disable PHP execution within user-generated content
ini_set('display_errors', 0);

// Sanitize and validate HTML input
$user_input = $_POST['user_input'];
$clean_input = htmlspecialchars($user_input);

Keywords

Cross-site scripting SQL injection code injection session hijacking file inclusion.

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