CP Contact Form with PayPal, CVE-2025-13384

CVE, Research URL: CVE-2025-13384
Home page URL: Security reports for CP Contact Form with PayPal
Application: CP Contact Form with PayPal
Published on: Nov 22, 2025
Research Description: The CP Contact Form with PayPal plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 1.3.56. This is due to the plugin exposing an unauthenticated IPN-like endpoint (via the 'cp_contactformpp_ipncheck' query parameter) that processes payment confirmations without any authentication, nonce verification, or PayPal IPN signature validation. This makes it possible for unauthenticated attackers to mark form submissions as paid without making actual payments by sending forged payment notification requests with arbitrary POST data (payment_status, txn_id, payer_email).
Affected versions: max 1.3.57.
Status: vulnerable