What’s Vulnerable › Vulnerabilities

CVE-2017-20192: Formidable Form Builder < 2.05.03 - Unauthenticated Stored Cross-Site Scripting

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-10-16 · updated 2026-06-17
• Weakness: CWE-79

Description

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.

Affected products

• strategy11team Formidable Forms – Contact Form Plugin, Survey, Quiz, Payment, Calculator Form & Custom Form Builder: before 2.05.03 — fixed in 2.05.03

How to fix

Upgrade to a fixed version: strategy11team Formidable Forms – Contact Form Plugin, Survey, Quiz, Payment, Calculator Form & Custom Form Builder 2.05.03. Check the vendor advisory for mitigations.

References

• https://klikki.fi/adv/formidable.html
• https://wordpress.org/plugins/formidable/#developers
• https://www.wordfence.com/threat-intel/vulnerabilities/id/900fcaab-2424-4ae8-af18-95659db0dbe3?source=cve

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