# CVE-2026-100179: Calculated Fields Form plugin for WordPress reflected DOM XSS

Source: https://junglewise.ai/threats/cve-2026-100179-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-2026-100179 · Severity: medium · CVSS 6.1 · Published 2026-10-01

The Calculated Fields Form plugin for WordPress, used to build contact forms, payment forms, and quizzes, is vulnerable to a reflected cross-site scripting (XSS) attack. An attacker can craft a malicious link that, when clicked by a website visitor, injects malicious JavaScript into the page, potentially stealing credentials, session cookies, or performing unauthorized actions on behalf of the victim.

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-2026-100179 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-100179 being exploited in the wild.

**How severe is CVE-2026-100179?** Medium severity, with a CVSS score of 6.1, published 1 October 2026.

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

**Is there a fix for CVE-2026-100179?** 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-2026-100179 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-100179?** 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 vulnerability is a reflected DOM-based XSS in the plugin's form handling code, where URL parameters consumed by the form's calculated equation are passed through the GETURLPARAMETER() function and piped into setChoices() without sufficient sanitization or output escaping. An unauthenticated attacker can inject arbitrary JavaScript by crafting a link targeting a page with a public form configured with a Select2-enabled dropdown populated via this calculated equation; no user interaction beyond clicking the link is required if the target form configuration matches.

## Affected products

- calculated-fields-form Calculated Fields Form up to 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/fields-public/08_fbuilder.fdropdown.js](https://plugins.trac.wordpress.org/browser/calculated-fields-form/tags/5.5.1.2/js/fields-public/08_fbuilder.fdropdown.js)
- [https://plugins.trac.wordpress.org/browser/calculated-fields-form/tags/5.5.1.2/js/fields-public/08_fbuilder.fdropdown.js](https://plugins.trac.wordpress.org/browser/calculated-fields-form/tags/5.5.1.2/js/fields-public/08_fbuilder.fdropdown.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 reflected DOM-based XSS](https://junglewise.ai/threats/cve-2026-100184-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)