Formidable Forms <= 6.28 - Missing Authorization to Unauthenticated Payment Integrity Bypass via PaymentIntent Reuse
| CVE | CVE-2026-2890 |
|---|---|
| CVSS | 7.5 (High) |
| Publicly Published | March 12, 2026 |
| Last Updated | March 13, 2026 |
| Researcher |
Andrés Cruciani
|
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.
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Vulnerability Details for Formidable Forms – WordPress Form Builder for Contact Forms, Calculators, Quizzes & More
| Software Type | Plugin |
|---|---|
| Software Slug | formidable (view on wordpress.org) |
| Patched? | Yes |
| Remediation | Update to version 6.29, or a newer patched version |
| Affected Version |
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| Patched Version |
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Recent vulnerabilities in Formidable Forms – WordPress Form Builder for Contact Forms, Calculators, Quizzes & More
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