PT-2026-44772 · WordPress · Contact Form 7 – Paypal & Stripe Add-On
Muni Nitish Kumar Yaddala
+1
·
Published
2026-05-29
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Updated
2026-06-18
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CVE-2026-9189
CVSS v3.1
5.3
Medium
| Vector | AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
Name of the Vulnerable Software and Affected Versions
Contact Form 7 – PayPal & Stripe Add-on versions prior to 2.5.0
Description
The plugin is subject to a payment bypass due to insufficient verification of data authenticity. While the
cf7pp paypal ipn handler() function validates IPN authenticity by posting back to PayPal using cmd= notify-validate, it does not verify if the mc gross (payment amount), mc currency, or receiver email fields in the IPN payload match the stored order values. Instead, the attacker-controlled invoice field is passed directly to cf7pp complete payment(), which marks the order as completed after a simple integer cast without verifying the payment amount. This allows unauthenticated attackers to mark high-value pending orders as paid by making a minimal payment and crafting an IPN where the invoice parameter references the target order.Recommendations
Update the plugin to a version later than 2.4.9.
Fix
Insufficient Verification of Data Authenticity
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Weakness Enumeration
Related Identifiers
Affected Products
Contact Form 7 – Paypal & Stripe Add-On