Formidable Forms – Contact Form, Survey, Quiz, Payment, Calculator Form & Custom Form Builder, CVE-2026-2890
- CVE, Research URL
- Home page URL
- Application
- Published on
- Mar 14, 2026
- Research Description
- The Formidable Forms plugin for WordPress is vulnerable to a payment integrity bypass in all versions up to, and including, 6.28. This is due to the Stripe Link return handler (`handle_one_time_stripe_link_return_url`) marking payment records as complete based solely on the Stripe PaymentIntent status without comparing the intent's charged amount against the expected payment amount, and the `verify_intent()` function validating only client secret ownership without binding intents to specific forms or actions. This makes it possible for unauthenticated attackers to reuse a PaymentIntent from a completed low-value payment to mark a high-value payment as complete, effectively bypassing payment for goods or services.
- Affected versions
-
max 6.29.
- Status
-
vulnerable