Formidable Form Builder <= 2.0.21 - Missing Authorization Checks

Improper Access Control
CVSS 9.1 (Critical)
Publicly Published February 16, 2016
Last Updated February 1, 2023
Researcher James Golovich


The Formidable Form Builder plugin for WordPress is vulnerable to authorization bypass in versions up to, and including, 2.0.21. This is due to missing nonce and capability checks on the 'frm_fill_licenses' and 'frm_ajax' AJAX actions. This makes it possible for unauthenticated attackers to access leaked nonces and modify form fields.



1 affected software package

Software Type Plugin
Software Slug formidable (view on
Patched? Yes
Remediation Update to version 2.0.22, or a newer patched version
Affected Version
  • <= 2.0.21
Patched Version
  • 2.0.22

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