CP Contact Form with PayPal <= 1.3.56 - Missing Authorization to Unauthenticated Arbitrary Payment Confirmation

Missing Authorization
CVE CVE-2025-13384
CVSS High (7.5)
Publicly Published November 21, 2025
Last Updated November 22, 2025
Researcher Md. Moniruzzaman Prodhan (NomanProdhan)
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).

References

1 affected software package

Software Type Plugin
Software Slug cp-contact-form-with-paypal (view on wordpress.org)
Patched? Yes
Affected Version
  • <= 1.3.56
Patched Version
  • 1.3.57
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