{
 "id": "WPSEC-2026-3059",
 "url": "https://wpsec.com/vuln/WPSEC-2026-3059/",
 "json_url": "https://wpsec.com/vuln/WPSEC-2026-3059/advisory.json",
 "markdown_url": "https://wpsec.com/vuln/WPSEC-2026-3059/index.md",
 "title": "YITH WooCommerce Product Add-Ons <= 4.35.0 - Unauthenticated Price Manipulation via 'yith_wapo_product_qty' Parameter",
 "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.",
 "plugin": {
  "slug": "yith-woocommerce-product-add-ons",
  "name": "YITH WooCommerce Product Add-Ons",
  "full_name": "YITH WooCommerce Product Add-Ons",
  "wordpress_org": "https://wordpress.org/plugins/yith-woocommerce-product-add-ons/",
  "advisories_url": "https://wpsec.com/vuln/plugin/yith-woocommerce-product-add-ons/",
  "attacksurface": "https://attacksurface.wpsec.com/plugin/yith-woocommerce-product-add-ons"
 },
 "type": "UNKNOWN",
 "cwe": [
  "CWE-20"
 ],
 "cve": [],
 "cvss": {
  "version": "3.1",
  "score": 5.3,
  "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
  "severity": "Medium"
 },
 "affected": {
  "ranges": [
   {
    "from": "4.0.0",
    "from_inclusive": true,
    "to": "4.35.1",
    "to_inclusive": false
   }
  ],
  "text": [
   "from 4.0.0 before 4.35.1"
  ]
 },
 "introduced_in": "4.0.0",
 "fixed_in": "4.35.1",
 "remediation": "Update to 4.35.1 or later.",
 "fix_released": "2026-11-12T12:49:10+00:00",
 "published": "2026-11-13T13:41:21+00:00",
 "updated": "2026-11-12T17:15:54.990773+00:00",
 "also_published_as": null,
 "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/"
 ],
 "attacksurface_url": "https://attacksurface.wpsec.com/plugin/yith-woocommerce-product-add-ons",
 "source": "WPSec",
 "license": {
  "name": "CC BY 4.0",
  "url": "https://creativecommons.org/licenses/by/4.0/"
 },
 "usage": {
  "plugin": "Medium",
  "affected_versions": "Medium",
  "as_of": "2026-11-13"
 }
}