Fluent Forms <= 6.2.15 - Unauthenticated Payment Bypass via Oversized Payment Amounts, Quantities and Checkbox Values
- ID
- WPSEC-2026-1193
- Plugin
- Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder (fluentform)
- Affected
- all versions before 6.2.16
- Remediation
- Update to 6.2.16 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness
- CWE-20
- Usage
- Plugin High · Affected versions High among sites WPSec scans, 2026-10-17
- Attack surface
- Fluent Forms on WPSec AttackSurface
- Fix released
- Published
Description
The Fluent Forms plugin for WordPress is vulnerable to a payment bypass via payment form inputs in all versions up to, and including, 6.2.15, due to insufficient validation of user-supplied payment amounts, custom subscription values, item quantities and checkbox payment item values. Infinite or oversized numbers (such as 1e400) passed the positive-number check, and scalar checkbox values passed the option check. This makes it possible for unauthenticated attackers to submit values that make the stored order total zero or drop server-priced items, so the payment gateway is skipped and paid items or services are obtained for free.
References
- https://wpsec.com/vuln/WPSEC-2026-1193/
- https://plugins.svn.wordpress.org/fluentform/tags/6.2.16/
- https://wordpress.org/plugins/fluentform/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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