CVE-2026-100179
Received Received - Intake

Reflected DOM-Based XSS in Calculated Fields Form WordPress Plugin

Publication date: 2026-10-01

Last updated on: 2026-10-01

Assigner: Wordfence

Description
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 (any URL parameter consumed by the form's calculated equation)' 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 the target site to have a public form configured with a Select2-enabled dropdown whose choices are populated via a calculated equation that pipes a URL parameter through GETURLPARAMETER() into setChoices({texts:[...]}); given that configuration, exploitation requires only a single crafted link.

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Meta Information

Published
2026-10-01
Last Modified
2026-10-01
Generated
2026-10-01
AI Q&A
2026-10-01
EPSS Evaluated
N/A
NVD
CVE-2026-100179
EUVD
EUVD-2026-90561

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
calculated_fields_form calculated_fields_form to 5.5.1.3 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This WordPress plugin vulnerability is a Reflected DOM-Based Cross-Site Scripting (XSS) issue. It exists in the Calculated Fields Form – AI Form Builder plugin versions up to 5.5.1.3. The flaw allows attackers to inject malicious scripts via URL parameters used in form calculations. These scripts execute when a user clicks a specially crafted link, potentially stealing data or performing unauthorized actions.

Detection Guidance

To detect this vulnerability, inspect WordPress sites running the Calculated Fields Form plugin versions up to 5.5.1.3. Check for forms with Select2-enabled dropdowns using calculated equations that process URL parameters via GETURLPARAMETER(). Look for suspicious scripts in form outputs or network requests.

Impact Analysis

If you use this plugin, attackers could trick you or your users into clicking a malicious link. This could lead to stolen session cookies, login credentials, or other sensitive data. Attackers might also perform actions on your behalf, such as changing settings or posting unauthorized content.

Compliance Impact

This vulnerability could lead to data breaches, violating GDPR and HIPAA requirements for protecting personal and health data. Organizations may face fines or legal action if user data is compromised due to this flaw.

Mitigation Strategies

Immediately update the Calculated Fields Form plugin to the latest version. If an update is unavailable, disable the plugin or remove forms using Select2-enabled dropdowns with calculated equations. Implement input sanitization for URL parameters in forms.

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