Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder: A security weakness
Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder is affected by a security weakness. The vulnerable path is reachable without authentication. The resulting impact depends on how the affected component exposes the vulnerable operation. The published affected range is 6.1.21.
- Component
- Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder
- Affected
- 6.1.21
- Safe version
- See mitigation notes
- Published
- Apr 16, 2026
This CVE was published Apr 16, 2026 and is one of 5 known issues for this plugin.
Update, patch or deactivate.
Update Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder to a release outside the affected range, or disable and remove it until a fixed version is available.
No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical 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").
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N