CVE-2026-18328
Received Received - Intake

DOM-Based Reflected Cross-Site Scripting in Forminator WordPress Plugin

Publication date: 2026-08-25

Last updated on: 2026-08-25

Assigner: Wordfence

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-08-25
Last Modified
2026-08-25
Generated
2026-08-25
AI Q&A
2026-08-25
EPSS Evaluated
N/A
NVD
CVE-2026-18328
EUVD
EUVD-2026-65316

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wpforms forminator to 1.57.0 (inc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
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.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is a DOM-Based Reflected Cross-Site Scripting (XSS) vulnerability in the Forminator Forms WordPress plugin. It exists due to insufficient input sanitization and output escaping in the 'error_description' parameter. Attackers can inject malicious scripts that execute when users access a page with an injected Forminator form configured to use Stripe Checkout Sessions.

Detection Guidance

To detect this vulnerability, inspect WordPress sites using Forminator plugin versions up to 1.57.0. Check pages hosting Forminator forms configured with Stripe Checkout Sessions. Look for DOM-based reflected XSS via the 'error_description' parameter in form submissions.

Impact Analysis

Unauthenticated attackers could execute arbitrary web scripts in your browser when visiting a page with a vulnerable Forminator form. This could lead to theft of cookies, session tokens, or other sensitive data. It may also enable phishing attacks or defacement of your WordPress site.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, potentially violating GDPR (data protection) and HIPAA (health information privacy) requirements. Organizations may face compliance breaches if user data is compromised through this exploit.

Mitigation Strategies

Update the Forminator plugin to the latest version beyond 1.57.0 immediately. Disable Stripe Checkout Sessions integration if not required. Implement web application firewall rules to block malicious input via the 'error_description' parameter.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-18328. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart