What’s Vulnerable › Vulnerabilities

CVE-2021-24608: Formidable Form Builder < 5.0.07 - Admin+ Stored Cross-Site Scripting

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-10-25 · updated 2026-06-17
• Weakness: CWE-79

Description

The Formidable Form Builder – Contact Form, Survey & Quiz Forms Plugin for WordPress plugin before 5.0.07 does not sanitise and escape its Form's Labels, allowing high privileged users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed

Affected products

• strategy11team Formidable Forms – Contact Form Plugin, Survey, Quiz, Payment, Calculator Form & Custom Form Builder: before 5.0.07 — fixed in 5.0.07

How to fix

Upgrade to a fixed version: strategy11team Formidable Forms – Contact Form Plugin, Survey, Quiz, Payment, Calculator Form & Custom Form Builder 5.0.07. Check the vendor advisory for mitigations.

References

• https://plugins.trac.wordpress.org/changeset/2609911
• https://wpscan.com/vulnerability/75305ea8-730b-4caf-a3c6-cb94adee683c
• https://plugins.trac.wordpress.org/changeset/2609911
• https://wpscan.com/vulnerability/75305ea8-730b-4caf-a3c6-cb94adee683c

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