# SellKit – Funnel builder and checkout optimizer for WooCommerce to sell more, faster <= 2.7.0 - Unauthenticated Price Manipulation via 'sellkit_product_prices' Parameter

- **ID:** WPSEC-2026-0485
- **Plugin:** SellKit – Funnel builder and checkout optimizer for WooCommerce to sell more, faster (`sellkit`), https://wordpress.org/plugins/sellkit/
- **Affected versions:** from 2.3.5 before 2.8.0
- **Fixed in:** 2.8.0 (Update to 2.8.0 or later.)
- **Severity:** High 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
- **Weakness:** CWE-472
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-10-06)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/sellkit
- **Fix released:** 2026-10-06
- **Published:** 2026-10-07
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0485/

## Description

The SellKit plugin for WordPress is vulnerable to Price Manipulation via the 'sellkit_product_prices' parameter in versions 2.3.5 up to, and including, 2.7.0. This is due to the cart price calculation hook (in both the Elementor and block editor checkout implementations) trusting a client-supplied JSON map of product IDs to prices, intended to carry upsell prices back from a hidden checkout form field, and applying those values to matching cart items with set_price() when the order is placed. This makes it possible for unauthenticated attackers to purchase products at arbitrary prices, including zero, by adding the parameter to a checkout submission.

## References

- https://wpsec.com/vuln/WPSEC-2026-0485/
- https://plugins.svn.wordpress.org/sellkit/tags/2.8.0/
- https://wordpress.org/plugins/sellkit/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0485/

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.