Upsell Funnel Builder for WooCommerce <= 3.0.0 - Unauthenticated Order Manipulation
Strategic Overview
- Status
- Patched in 3.0.1
- Affected Plugin
- Upsell Funnel Builder for WooCommerce – Create Upsells, Cross-Sells, Order Bumps, Frequently Bought, and Popups.
- Affected Version
<= 3.0.0- CVSS
- 5.3Medium
- Weakness type
- CWE-472 · External Control of Assumed-Immutable Web Parameter
- CVE
CVE-2025-3743
At a glance
CVE-2025-3743 is a medium-severity External Control of Assumed-Immutable Web Parameter vulnerability in the Upsell Funnel Builder for WooCommerce WordPress plugin, affecting versions <= 3.0.0. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 3.0.1; sites on affected versions should update now. Disclosed April 2025, reported by p4.
Vulnerability Overview
The Upsell Funnel Builder for WooCommerce plugin for WordPress is vulnerable to order manipulation in all versions up to, and including, 3.0.0. This is due to the plugin allowing the additional product ID and discount field to be manipulated prior to processing via the 'add_offer_in_cart' function. This makes it possible for unauthenticated attackers to arbitrarily update the product associated with any order bump, and arbitrarily update the discount applied to any order bump item, when adding it to the cart.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.
CWE-472: External Control of Assumed-Immutable Web Parameter
Upsell Funnel Builder for WooCommerce <= 3.0.0 carries this weakness at add_offer_in_cart, and reaching it takes no account at all. External control of an assumed-immutable parameter means the code trusts a value it believes cannot be changed by the caller, when in fact the request carries it.
Editing that field changes the outcome of the operation, which on commerce plugins means altered prices or totals and on account flows means acting as another user. For Upsell Funnel Builder for WooCommerce the fix is 3.0.1: builds <= 3.0.0 are affected, anything from 3.0.1 onward is not.
Remediation
Update to version 3.0.1, or a newer patched version
How does WordSec protect against this?
Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Upsell Funnel Builder for WooCommerce 3.0.1 closes this, and updating the plugin is the step that ends it.
- Firewall
- Login Security
- Alerts
External References
Related records
Other vulnerabilities in Upsell Funnel Builder for WooCommerce – Create Upsells, Cross-Sells, Order Bumps, Frequently Bought, and Popups.
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