CVE-2026-100184: Calculated Fields Form <= 5.5.1.3 - Reflected DOM-Based Cross-Site Scripting via 'x' URL Query Parameter via Text Area Predefined Value
The Calculated Fields Form – AI Form Builder for WordPress – Contact, Payment, Quote, Quiz & More plugin for WordPress is vulnerable to Reflected DOM-Based Cross-Site Scripting via the 'x (attacker-chosen name matching the form's url.<name> predefined value)' parameter in all versions up to, and including, 5.5.1.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. Exploitation requires that the targeted form has a Text Area field configured with a 'url.<name>' Predefined Value and predefinedClick disabled, which is a documented and commonly used plugin feature.
Affected Software
Event History
Frequently Asked Questions
Which sites are exposed to exploitation?
Sites using Calculated Fields Form version 5.5.1.3 or earlier are exposed only where a targeted form includes a Text Area field configured with a url.<name> Predefined Value and has predefinedClick disabled. This configuration is documented and commonly used.
What does an attacker need to exploit this issue?
No authentication is required, but the attacker must know or choose the query-parameter name corresponding to the form's url.<name> predefined value. They must also persuade a victim to perform an action such as clicking a crafted link.
Is a default installation affected?
The issue depends on a specific form-field configuration rather than being described as affecting every form by default. Forms without the relevant Text Area url.<name> Predefined Value configuration and predefinedClick disabled are not identified as exploitable by the provided information.