What are the security implications of including external scripts or content in PHP pages?

Including external scripts or content in PHP pages can introduce security vulnerabilities such as cross-site scripting (XSS) or remote code execution. To mitigate these risks, it is important to sanitize and validate any external content before including it in your PHP pages. 

// Sanitize and validate external content before including it in PHP pages
$externalContent = $_GET['external_content'];

// Example of sanitizing and validating external content
$allowedContent = ['script', 'img', 'a']; // Define allowed HTML tags
if (in_array($externalContent, $allowedContent)) {
    echo "<{$externalContent}>External Content</{$externalContent}>";
} else {
    echo "Invalid content";
}

Keywords

XSS CSRF SQL injection Content Security Policy Cross-origin resource sharing

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