# CVE-2026-100184: Calculated Fields Form plugin reflected DOM-based XSS

Source: https://junglewise.ai/threats/cve-2026-100184-the-calculated-fields-form-ai-form-builder-for-wordpress-contact  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-01. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-100184 · Severity: medium · CVSS 4.7 · Published 2026-10-01

The Calculated Fields Form plugin for WordPress, used to create contact forms, payment forms, quizzes and surveys, is vulnerable to reflected cross-site scripting (XSS). An attacker can craft a malicious link that, when clicked by a user, injects and executes arbitrary JavaScript in the victim's browser, potentially stealing session cookies, account credentials, or sensitive form data entered into the affected form.

Technologies: [Calculated Fields Form](https://junglewise.ai/threats/technologies/calculated-fields-form). Vendors: [Calculated Fields Form](https://junglewise.ai/threats/vendors/calculated-fields-form).

## Quick answers

**Is CVE-2026-100184 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-100184 being exploited in the wild.

**How severe is CVE-2026-100184?** Medium severity, with a CVSS score of 4.7, published 1 October 2026.

**Which products and versions are affected?** Calculated Fields Form up to and including 5.5.1.3.

**Is there a fix for CVE-2026-100184?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-100184 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-100184?** Check whether you run Calculated Fields Form at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The plugin is vulnerable to reflected DOM-based XSS via the 'x' parameter (where x is an attacker-chosen name matching the form's url.<name> predefined value) due to insufficient input sanitization and output escaping. The vulnerability requires a Text Area field configured with a 'url.<name>' Predefined Value and predefinedClick disabled, which is a standard feature. Exploitation is unauthenticated and requires social engineering to trick a user into clicking a malicious link.

## Affected products

- Calculated Fields Form Calculated Fields Form up to and including 5.5.1.3

## Timeline

- 2026-10-01: disclosed

## References

- [https://plugins.trac.wordpress.org/browser/calculated-fields-form/tags/5.5.1.2/js/fbuilder-pro-public.jquery.js](https://plugins.trac.wordpress.org/browser/calculated-fields-form/tags/5.5.1.2/js/fbuilder-pro-public.jquery.js)
- [https://plugins.trac.wordpress.org/browser/calculated-fields-form/tags/5.5.1.2/js/fbuilder-pro-public.jquery.js](https://plugins.trac.wordpress.org/browser/calculated-fields-form/tags/5.5.1.2/js/fbuilder-pro-public.jquery.js)

## Related threats

- [Calculated Fields Form reflected DOM-based XSS in URL parameters](https://junglewise.ai/threats/cve-2026-103909-the-calculated-fields-form-ai-form-builder-for-wordpress-contact)
- [Calculated Fields Form plugin for WordPress reflected DOM XSS](https://junglewise.ai/threats/cve-2026-100179-the-calculated-fields-form-ai-form-builder-for-wordpress-contact)
- [Calculated Fields Form cross-site scripting in form handling](https://junglewise.ai/threats/cve-2026-95529-unauthenticated-cross-site-scripting-xss-in-calculated-fields)