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5.3
Fluent Forms plugin allows attackers to change payment status on pending submissions
CVE-2026-4160
Summary
The Fluent Forms plugin for WordPress has a security flaw that allows unauthorized users to change the payment status of pending submissions. This could allow attackers to trick people into thinking a payment was successful when it wasn't. To fix the issue, update the plugin to version 6.1.22 or later.
Original title
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 i...
Original 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").
nvd CVSS3.1
5.3
Vulnerability type
CWE-639
Authorization Bypass Through User-Controlled Key
Published: 16 Apr 2026 · Updated: 17 Apr 2026 · First seen: 16 Apr 2026