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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.

PUBLISHED Reserved 2026-04-01 | Published 2026-05-14 | Updated 2026-05-14 | Assigner Wordfence




HIGH: 8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Problem types

CWE-639 Authorization Bypass Through User-Controlled Key

Product status

Default status
unaffected

Any version
affected

Timeline

2026-03-09:Discovered
2026-04-02:Vendor Notified
2026-05-13:Disclosed

Credits

Sander Horsman finder

References

www.wordfence.com/...-0330-4dff-a5f8-08a108d724f5?source=cve

plugins.trac.wordpress.org/.../Policies/SubmissionPolicy.php

cve.org (CVE-2026-5396)

nvd.nist.gov (CVE-2026-5396)

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