Forminator Stripe forms permit unauthenticated DOM-based cross-site scripting

Forminator through 1.57.0 lets an unauthenticated attacker supply script-capable error_description input that reaches a DOM rendering path without adequate sanitization or escaping. The issue is reachable on pages containing a Forminator form configured for the Stripe Checkout Sessions payment API, which became the default in 1.56.0.

CVE / CNA score 7.2 CVSS 3.1 · security@wordfence.com

NVD score Pending NVD has not published its own CVSS assessment.

Component: Forminator Forms – Contact Form, Payment Form & Custom Form Builder
Plugin slug: forminator
Affected: <= 1.57.0
Safe version: See mitigation notes
Published: Aug 25, 2026
Weakness: CWE-79 — Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

This CVE was published Aug 25, 2026 and is one of 47 known issues for this plugin.

What to do

Update, patch or deactivate.

Version 1.57.1 is available, but its official changelog does not clearly identify this CVE. Update to the latest release, review Stripe-enabled forms, and invalidate privileged sessions if crafted payment-return links were opened. The official upstream changelog lists version 1.57.1, which is newer than the published affected range. Its changelog does not clearly confirm this specific fix, so it is not counted as a known-safe release.

No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical 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.

CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

References

Primary and upstream sources

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