# Forminator Forms <= 1.57.3.1 - Unauthenticated PayPal Order Request Tampering via Form Submission

- **ID:** WPSEC-2026-0623
- **Plugin:** Forminator Forms – Contact Form, Payment Form & Custom Form Builder (`forminator`), https://wordpress.org/plugins/forminator/
- **Affected versions:** all versions before 1.58.0
- **Fixed in:** 1.58.0 (Update to 1.58.0 or later.)
- **Severity:** Medium 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
- **Weakness:** CWE-20
- **Usage among sites WPSec scans:** plugin Medium, affected versions Medium (as of 2026-10-08)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/forminator
- **Fix released:** 2026-10-07
- **Published:** 2026-10-08
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0623/

## Description

The Forminator Forms plugin for WordPress is vulnerable to request tampering in its PayPal order creation handler in all versions up to, and including, 1.57.3.1 due to client-supplied request data being merged into the PayPal create-order request. This makes it possible for unauthenticated attackers to add their own properties to the order sent to PayPal, such as an additional purchase unit, a payee or an application context, on forms that use a PayPal field. The amount recorded for the submission is re-validated against the form settings before the payment is captured.

## References

- https://wpsec.com/vuln/WPSEC-2026-0623/
- https://plugins.svn.wordpress.org/forminator/tags/1.58.0/
- https://wordpress.org/plugins/forminator/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0623/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.