What are the potential security risks associated with using PHPMailer for sending emails with sensitive information?

One potential security risk associated with using PHPMailer for sending emails with sensitive information is the possibility of email injection attacks, where an attacker could manipulate email headers to send malicious content or spoof the sender's address. To mitigate this risk, it is important to sanitize and validate user input before using it in email headers. 

// Sanitize and validate email headers before sending
$to = filter_var($_POST['to'], FILTER_VALIDATE_EMAIL);
$subject = filter_var($_POST['subject'], FILTER_SANITIZE_STRING);
$message = filter_var($_POST['message'], FILTER_SANITIZE_STRING);

// Instantiate PHPMailer
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

require 'vendor/autoload.php';

$mail = new PHPMailer(true);

// Set email parameters
$mail->setFrom('your@example.com', 'Your Name');
$mail->addAddress($to);
$mail->Subject = $subject;
$mail->Body = $message;

// Send email
$mail->send();

Keywords

PHPMailer security risks sensitive information email sending vulnerabilities

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