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Tool Directory

CVE-2017-20192

HighPublished

Formidable Form Builder < 2.05.03 - Unauthenticated Stored Cross-Site Scripting

Published: Oct 16, 2024
Updated: Apr 8, 2026
Assigning CNA: Wordfence
Evidence observed: Aug 8, 2026

Primary CVSS

8.3/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

EPSS probability estimate

1.0%

Low · next 30 days

Percentile: 61.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

The Formidable Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via multiple parameters submitted during form entries like 'after_html' in versions before 2.05.03 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute in a victim's browser.

Sources

CVE-2017-20192-formidable-formsPoC
Reproducible Docker lab for CVE-2017-20192 (Formidable Forms < 2.05.03 stored XSS) with automated PoC script for unauthenticated exploitation and admin validation.

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