CVE-2026-18328
Forminator Forms <= 1.57.0 - Unauthenticated DOM-Based Cross-Site Scripting via 'error_description' Parameter
- State
- Published
- Severity
- 7.2 High
- Published
- Aug 25, 2026
- Updated
- Aug 25, 2026
- Reserved
- Jul 29, 2026
Description
The Forminator Forms – Contact Form, Payment Form & Custom Form Builder plugin for WordPress is vulnerable to DOM-Based Reflected Cross-Site Scripting via the 'error_description' parameter in all versions up to, and including, 1.57.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The vulnerability is only triggerable on pages hosting a Forminator form configured to use the Stripe Checkout Sessions payment API, which became the default in 1.56.0.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.2 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N | Wordfence |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
Forminator Forms – Contact Form, Payment Form & Custom Form Builderwpmudev |
|
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/a669f05d-67c7-45ac-ae56-e7c637ece880?source=cve
- https://plugins.trac.wordpress.org/browser/forminator/tags/1.56.0/assets/js/front/front.stripe.js#L196
- https://plugins.trac.wordpress.org/browser/forminator/tags/1.56.0/assets/js/front/front.stripe.js#L543
- https://plugins.trac.wordpress.org/browser/forminator/tags/1.56.0/assets/js/front/front.stripe.js#L1539
- https://plugins.trac.wordpress.org/browser/forminator/tags/1.56.0/assets/js/front/front.stripe.js#L468
- https://plugins.trac.wordpress.org/changeset/3652645/forminator/trunk/assets/js/front/front.stripe.js
- https://plugins.trac.wordpress.org/changeset?old_path=%2Fforminator/tags/1.57.0&new_path=%2Fforminator/tags/1.57.0.1
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