What potential security risks are associated with not implementing CSRF tokens in PHP forms?

Not implementing CSRF tokens in PHP forms can leave your application vulnerable to CSRF attacks, where an attacker can trick a user into unknowingly submitting a malicious request on behalf of the user. To mitigate this risk, you should generate unique CSRF tokens for each form submission and validate them on the server side. 

<?php
session_start();

if(empty($_SESSION['csrf_token'])) {
    $_SESSION['csrf_token'] = bin2hex(random_bytes(32));
}

$csrf_token = $_SESSION['csrf_token'];

// In your form HTML
echo '<input type="hidden" name="csrf_token" value="' . $csrf_token . '">';

// Validate CSRF token on form submission
if($_POST['csrf_token'] !== $_SESSION['csrf_token']) {
    // Handle invalid CSRF token
    die('Invalid CSRF token');
}

Keywords

CSRF tokens security risks PHP forms implementation vulnerabilities

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