Vulnerability · Published Apr 16, 2026 · Assigned by Wordfence
CVE-2026-4160Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder <= 6.1.21 - Insecure Direct Object Reference in Stripe SCA Confirmation to Unauthenticated Payment Status Modification
Medium 5.3
In plain English
A medium-severity authorization bypass via user-controlled key in Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder from techjewel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).
Official description
The Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder plugin for WordPress is vulnerable to Insecure Direct Object Reference via the 'submission_id' parameter in versions up to, and including, 6.1.21. This is due to missing authorization and ownership validation on a user controlled key in the Stripe SCA confirmation AJAX endpoint. This makes it possible for unauthenticated attackers to modify payment status of targeted pending submissions (for example, setting the status to "failed").
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| techjewel | Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder | 6.1.21 |
Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N