Formidable Form Builder < 2.05.03 - Reflected Cross-Site Scripting

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS 6.1 (Medium)
Publicly Published November 13, 2017
Last Updated January 22, 2024
Researcher Jouko Pynnöne


The Formidable Form Builder plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'before_html' parameter passed through the frm_forms_preview AJAX action in versions before 2.05.03 due to insufficient input sanitization and output escaping. This makes it possible for attackers to inject arbitrary web scripts that execute in a victim's browser whenever they successfully trick a victim into performing an action like clicking on a link.

Wordfence blocked 81 attacks targeting this vulnerability in the past 24 hours.



Vulnerability Details for Formidable Forms – Contact Form Plugin, Survey, Quiz, Payment, Calculator Form & Custom Form Builder

Software Type Plugin
Software Slug formidable (view on
Patched? Yes
Remediation Update to version 2.05.03, or a newer patched version
Affected Version
  • < 2.05.03
Patched Version
  • 2.05.03

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