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Vulnerability record · CVE-2026-18328 · published 25 August 2026

CVE-2026-18328: Cross-site scripting vulnerability

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.

7.2 CVSS 3.1 High EPSS 0.35% · top 74.5% CWE-79 · Cross-site scripting Deferred
7.2CVSS 3.1 base score
0.35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
7References
26 Aug 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

References

LinkTags
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#L196
https://plugins.trac.wordpress.org/browser/forminator/tags/1.56.0/assets/js/front/front.stripe.js#L468
https://plugins.trac.wordpress.org/browser/forminator/tags/1.56.0/assets/js/front/front.stripe.js#L543
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
https://www.wordfence.com/threat-intel/vulnerabilities/id/a669f05d-67c7-45ac-ae56-e7c637ece880?source=cve

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Source: NIST National Vulnerability Database (record CVE-2026-18328), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.