CVE-2026-5396 Fluent Forms <= 6.1.21 - Authenticated (Subscriber+) Authorization Bypass via 'form_id' Parameter
Authenticated attackers can bypass authorization to read, modify, or delete form submissions from unauthorized forms by manipulating the form_id parameter.
- 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-2026-5396?
CVE-2026-5396 is a high-severity missing authorization vulnerability in techjewel Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder, published on 14 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Fluent Forms plugin for WordPress is vulnerable to Authorization Bypass Through User-Controlled Key in all versions up to, and including, 6.1.21. This is due to the SubmissionPolicy class authorizing submission-level actions (read, modify, delete, add notes) based on a user-supplied `form_id` query parameter. This makes it possible for authenticated attackers, with Fluent Forms Manager access restricted to specific forms, to read, modify status, add notes to, and permanently delete form submissions belonging to any other form by spoofing the form_id parameter to a form they are authorized for.
Weakness: CWE-639
Which versions are affected by CVE-2026-5396?
How do I fix CVE-2026-5396?
No fix has been published for CVE-2026-5396 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-2026-5396 being exploited?
There is no known exploitation of CVE-2026-5396 in the wild and no public exploit code.
Sources
Also known as GHSA-px32-v334-cgrw.