What are the potential risks of not properly handling tags in a PHP blog system?

Improperly handling tags in a PHP blog system can lead to security vulnerabilities such as SQL injection attacks or cross-site scripting (XSS) attacks. To mitigate these risks, it is essential to properly sanitize and validate user input before using it in database queries or displaying it on the webpage. 

// Sanitize and validate user input for tags
$tags = filter_input(INPUT_POST, 'tags', FILTER_SANITIZE_STRING);

// Prepare and bind parameters for database query
$stmt = $pdo->prepare("INSERT INTO posts (title, content, tags) VALUES (:title, :content, :tags)");
$stmt->bindParam(':title', $title);
$stmt->bindParam(':content', $content);
$stmt->bindParam(':tags', $tags);
$stmt->execute();

Keywords

XSS SQL injection security vulnerability input validation escaping.

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