# SureForms – Contact Form Builder, AI Forms, Payment Form, Survey & Quiz <= 2.13.1 - Unauthenticated Payment Amount Manipulation via Calculated Hidden Amount Field

- **ID:** WPSEC-2026-3055
- **Plugin:** SureForms – Contact Form Builder, AI Forms, Payment Form, Survey & Quiz (`sureforms`), https://wordpress.org/plugins/sureforms/
- **Affected versions:** from 2.11.1 before 2.14.0
- **Fixed in:** 2.14.0 (Update to 2.14.0 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-602
- **Usage among sites WPSec scans:** plugin Medium, affected versions Low (as of 2026-11-13)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/sureforms
- **Fix released:** 2026-11-12
- **Published:** 2026-11-13
- **URL:** https://wpsec.com/vuln/WPSEC-2026-3055/

## Description

The SureForms plugin for WordPress is vulnerable to payment amount manipulation in versions 2.11.1 up to, and including, 2.13.1. This is due to the server-side payment amount check falling back to the form's minimum-amount floor when a calculation-enabled hidden field supplies the amount and its formula cannot be recomputed on the server. This makes it possible for unauthenticated attackers to pay less than the calculated price on forms that take their amount from such a field.

## References

- https://wpsec.com/vuln/WPSEC-2026-3055/
- https://plugins.svn.wordpress.org/sureforms/tags/2.14.0/
- https://wordpress.org/plugins/sureforms/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-3055/

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.