CVE-2024-6520: Fluentforms Contact Form

Medium severity, CVSS 4.4. EPSS: 0.3% chance of exploitation in the next 30 days.

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 custom error message 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

• Fluentforms Contact Form: before 5.1.20 (fixed in 5.1.20)

Published 2024-07-27. Last modified 2026-06-17.