CVE-2024-6518: Contact Form Plugin by Fluent Forms for Quiz, Survey, and Drag & Drop WP Form Builder <= 5.1.19 - Authenticated (Administrator+) Stored Cross-Site Scripting

Severity: medium (CVSS 4.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-07-27 · updated 2026-06-17
Weakness: CWE-79

Description

The Contact Form Plugin by Fluent Forms for Quiz, Survey, and Drag & Drop WP Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via input fields in all versions up to, and including, 5.1.19 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

Affected products

techjewel Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder: before 5.1.20 — fixed in 5.1.20

How to fix

Upgrade to a fixed version: techjewel Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder 5.1.20. Check the vendor advisory for mitigations.

References

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