Vulnerabilities / YITH WooCommerce Product Add-Ons / WPSEC-2026-3059
YITH WooCommerce Product Add-Ons <= 4.35.0 - Unauthenticated Price Manipulation via 'yith_wapo_product_qty' Parameter
Medium 5.3
CWE-20Fixed in 4.35.1
- ID
- WPSEC-2026-3059
- Plugin
- YITH WooCommerce Product Add-Ons (yith-woocommerce-product-add-ons)
- Affected
- from 4.0.0 before 4.35.1
- Remediation
- Update to 4.35.1 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 Medium · Affected versions Medium among sites WPSec scans, 2026-11-13
- Attack surface
- YITH WooCommerce Product Add-Ons on WPSec AttackSurface
- Fix released
- Published
Description
The YITH WooCommerce Product Add-Ons plugin for WordPress is vulnerable to price manipulation via the 'yith_wapo_product_qty' parameter in all versions up to, and including, 4.35.0 due to insufficient validation of user-supplied add-on quantities. Posted quantities were stored in the cart item data and used in price calculation for any add-on type without being cast to non-negative integers. This makes it possible for unauthenticated attackers to submit negative or arbitrary quantities to reduce add-on prices and purchase products for less than their intended price.
References
- https://wpsec.com/vuln/WPSEC-2026-3059/
- https://plugins.svn.wordpress.org/yith-woocommerce-product-add-ons/tags/4.35.1/
- https://wordpress.org/plugins/yith-woocommerce-product-add-ons/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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