Description

The Fluent Forms plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the AI Form Builder module in all versions up to, and including, 6.1.14 due to a combination of missing authorization checks, a leaked nonce, and insufficient input sanitization. The vulnerability allows Subscriber-level users to trigger AI form generation via a protected endpoint. When prompted, AI services will typically return bare JavaScript code (without <script> tags), which bypasses the plugin's sanitization. This stored JavaScript executes whenever anyone views the generated form, making it possible for authenticated attackers with Subscriber-level access and above to inject arbitrary web scripts that will execute in the context of any user accessing the form.

Weaknesses 1

References 6

• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/fluentform/tags/6.1.12/app/Hooks/actions.php#L641
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/fluentform/tags/6.1.12/app/Modules/Ai/AiFormBuilder.php#L29
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/fluentform/tags/6.1.12/app/Modules/Ai/AiFormBuilder.php#L334
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/fluentform/tags/6.1.12/boot/globals.php#L438
• plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset/3449710/fluentform/trunk/app/Hooks/actions.php
• wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/00192a36-4b75-4dae-9a6e-0afb02ed5bad?source=cve

Remediation