CVE-2026-4160 Missing authorization in Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder
Unauthenticated attackers can modify payment statuses of pending form submissions due to missing authorization checks in the Stripe SCA confirmation endpoint.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4160?
CVE-2026-4160 is a medium-severity missing authorization vulnerability in techjewel Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder, published on 16 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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").
Weakness: CWE-639
Which versions are affected by CVE-2026-4160?
How do I fix CVE-2026-4160?
No fix has been published for CVE-2026-4160 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-4160 being exploited?
There is no known exploitation of CVE-2026-4160 in the wild and no public exploit code.
Sources
Also known as GHSA-23m2-3g75-jvc8.