What are the potential security risks of allowing users to upload images without a login system in PHP?

Allowing users to upload images without a login system in PHP can pose security risks such as unauthorized access, malicious file uploads, and potential server vulnerabilities. To mitigate these risks, it is important to implement user authentication and validation checks before allowing image uploads. 

// Check if user is logged in before allowing image upload
session_start();

if(!isset($_SESSION['user_id'])) {
    // Redirect to login page or display an error message
    header("Location: login.php");
    exit();
}

// Code for image upload process goes here

Keywords

file upload user authentication cross-site scripting SQL injection image validation

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