CVE-2026-103909
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk18th percentile - higher than 18% of all known CVEs
Summary
The Calculated Fields Form plugin for WordPress is vulnerable to Reflected DOM-Based Cross-Site Scripting via the 'arbitrary' parameter in all versions up to, and including, 5.5.1.5. An unauthenticated attacker can inject arbitrary web scripts if they can trick a user into clicking a link.
Risk Assessment
An attacker can execute arbitrary JavaScript in the victim's browser, potentially leading to session or data theft. However, this requires a specific form configuration with at least two url.<name> fields used in a concatenation equation.
Recommendation
Update the plugin to a version newer than 5.5.1.5 when available, and review form configurations for the use of multiple url.<name> fields in concatenation equations.
Other vulnerabilities in Calculated Fields Form
See all- CVE-2026-100179Medium
The Calculated Fields Form plugin for WordPress up to version 5.5.1.3 is vulnerable to Reflected DOM-Based XSS via the 'x' parameter (any URL parameter consumed by the form's calculated equation). Insufficient input sanitization and output escaping allow unauthenticated attackers to inject arbitrary scripts that execute when a user clicks a crafted link. Exploitation requires a public form with a Select2 dropdown populated via a calculated equation using GETURLPARAMETER() and setChoices().
- CVE-2026-100184Medium
The Calculated Fields Form plugin for WordPress up to version 5.5.1.3 is vulnerable to Reflected DOM-Based XSS via the 'x' parameter (attacker-chosen name matching the form's url.<name> predefined value). Insufficient input sanitization and output escaping allow unauthenticated attackers to inject arbitrary scripts that execute when a user clicks a crafted link. Exploitation requires a Text Area field with 'url.<name>' Predefined Value and predefinedClick disabled.
- CVE-2026-95529High
The Calculated Fields Form plugin in versions up to and including 5.5.1.1 contains an unauthenticated Cross Site Scripting (XSS) vulnerability. An unauthenticated attacker can inject malicious script into the page.
Original NVD description (English source)
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 'arbitrary (whichever names the admin bound via url.<name>)' parameter in all versions up to, and including, 5.5.1.5 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 targeted site to host a publicly accessible form in which an administrator has configured at least two fields with url.<name> predefined values that are used together in a concatenation equation — a plausible but not universal configuration.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS