CVE-2026-9189: Scottpaterson Contact Form 7 – PayPal & Stripe Add-On

Medium severity, CVSS 5.3. EPSS: 0.2% chance of exploitation in the next 30 days.

The Contact Form 7 – PayPal & Stripe Add-on plugin for WordPress is vulnerable to Payment Bypass via Insufficient Verification of Data Authenticity in all versions up to, and including, 2.4.9. Although `cf7pp_paypal_ipn_handler()` correctly validates IPN authenticity by posting back to PayPal with `cmd=_notify-validate`, it fails to compare the IPN payload's `mc_gross` (payment amount), `mc_currency`, or `receiver_email` fields against the corresponding stored order values before passing the attacker-controlled `invoice` field directly to `cf7pp_complete_payment()`, which marks the order completed after only an integer cast with no amount verification. This makes it possible for unauthenticated attackers to mark arbitrary high-value pending orders as fully paid by making a minimal real PayPal payment and crafting an IPN whose `invoice` parameter references the targeted order, effectively completing purchases without tendering the required payment amount.

Affected products

• Scottpaterson Contact Form 7 – PayPal & Stripe Add-On: up to and including 2.4.9

Published 2026-05-29. Last modified 2026-07-21.