Calculated Fields Form <= 5.5.1.3 - Reflected DOM-Based Cross-Site Scripting via 'x' URL Query Parameter via Text Area Predefined Value
Strategic Overview
- Status
- Patched in 5.5.1.4
- Affected Plugin
- Calculated Fields Form – AI Form Builder for WordPress – Contact, Payment, Quote, Quiz & More
- Affected Version
<= 5.5.1.3- CVSS
- 4.7Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2026-100184
At a glance
CVE-2026-100184 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Calculated Fields Form WordPress plugin, affecting versions <= 5.5.1.3. It carries a CVSS score of 4.7 (reachable over the network). Exploitation requires no authentication. The issue is fixed in version 5.5.1.4; sites on affected versions should update now. Disclosed September 2026, reported by UKO.
Vulnerability Overview
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.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, and no privileges on the target site.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Reaching this weakness in Calculated Fields Form <= 5.5.1.3 takes a caller who can reach the endpoint. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.
Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Calculated Fields Form the fix is 5.5.1.4: builds <= 5.5.1.3 are affected, anything from 5.5.1.4 onward is not.
Remediation
Update to version 5.5.1.4, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to Calculated Fields Form: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Calculated Fields Form 5.5.1.4 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in Calculated Fields Form – AI Form Builder for WordPress – Contact, Payment, Quote, Quiz & More
- 9.8Calculated Fields Form <= 1.0.11 CSRF to SQL Injection
- 6.1CVE-2026-103909: Calculated Fields Form Reflected DOM-Based XSS
CVE-2026-103909 - 6.1CVE-2026-100179: Calculated Fields Form Reflected DOM-Based XSS
CVE-2026-100179 - 6.1CVE-2024-29759: Calculated Fields Form <= 1.2.54 Reflected XSS
CVE-2024-29759 - 5.4CVE-2020-7228: Calculated Fields Form <= 1.0.353 Stored XSS
CVE-2020-7228 - 5.3CVE-2024-12601: Calculated Fields Form <= 5.2.63 Denial of Service
CVE-2024-12601 - 5.3CVE-2024-9940: Calculated Fields Form <= 5.2.45 HTML Injection
CVE-2024-9940 - 4.4CVE-2024-13381: Calculated Fields Form <= 5.2.61 Stored XSS
CVE-2024-13381
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