What the vulnerability does
01Description
The Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 6.1.7 via the 'submission_id' parameter due to missing validation on a user controlled key within the confirmScaPayment() function. This makes it possible for unauthenticated attackers to mark arbitrary submissions as failed via crafted requests to the endpoint granted they can guess or enumerate a valid submission identifier.
Explanation of Vulnerability in Simple Terms
02Summary
Fluent Forms versions 6.1.7 and earlier contain an integrity vulnerability allowing unauthenticated attackers to modify data over the network. The vulnerability requires no user interaction and can be exploited remotely. Site administrators should update to a version newer than 6.1.7 to remediate this issue.
What an attacker can do
03Attacker Capabilities
Modify form data or settings without authentication.
Potential impact on your site
04Site Impact
Form submissions or configurations could be altered by unauthorized parties.
Conditions required to exploit
05Prerequisites
Network access only; no authentication or user interaction required.
Key dates
06Disclosure timeline
December 6, 2025
CVE published
April 8, 2026
Record updated
