{
 "id": "WPSEC-2026-0943",
 "url": "https://wpsec.com/vuln/WPSEC-2026-0943/",
 "json_url": "https://wpsec.com/vuln/WPSEC-2026-0943/advisory.json",
 "markdown_url": "https://wpsec.com/vuln/WPSEC-2026-0943/index.md",
 "title": "Quick PayPal Payments <= 6.0.3 - Unauthenticated Payment Amount Manipulation via Payment Form Parameters",
 "description": "The Quick PayPal Payments plugin for WordPress is vulnerable to Payment Amount Manipulation via the payment form submission (the qpp_validate_form AJAX action and the [qpp] shortcode form post) in all versions up to, and including, 6.0.3. This is due to the plugin taking pricing data from the submitted form: price-setting shortcode attributes were posted back as unsigned fields, a posted field skipped validation, a posted form value switched which form's prices applied, loosely compared values matched a fixed price option, a quantity of zero was accepted on forms without a quantity field, and a crafted item amount lowered a subscription's per-period price. This makes it possible for unauthenticated attackers to pay less than the configured price and have the payment recorded as paid; since 5.7.51 the forged price is also stored as the amount the IPN check expects.",
 "plugin": {
  "slug": "quick-paypal-payments",
  "name": "Quick PayPal Payments",
  "full_name": "Quick PayPal Payments: Payment Button & Form",
  "wordpress_org": "https://wordpress.org/plugins/quick-paypal-payments/",
  "advisories_url": "https://wpsec.com/vuln/plugin/quick-paypal-payments/",
  "attacksurface": "https://attacksurface.wpsec.com/plugin/quick-paypal-payments"
 },
 "type": "BYPASS",
 "cwe": [
  "CWE-472"
 ],
 "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": null,
    "from_inclusive": true,
    "to": "6.0.4",
    "to_inclusive": false
   }
  ],
  "text": [
   "all versions before 6.0.4"
  ]
 },
 "introduced_in": null,
 "fixed_in": "6.0.4",
 "remediation": "Update to 6.0.4 or later.",
 "fix_released": "2026-10-12T18:25:50+00:00",
 "published": "2026-10-14T13:49:25+00:00",
 "updated": "2026-10-14T13:20:00.157619+00:00",
 "also_published_as": null,
 "references": [
  "https://wpsec.com/vuln/WPSEC-2026-0943/",
  "https://plugins.svn.wordpress.org/quick-paypal-payments/tags/6.0.4/",
  "https://wordpress.org/plugins/quick-paypal-payments/"
 ],
 "attacksurface_url": "https://attacksurface.wpsec.com/plugin/quick-paypal-payments",
 "source": "WPSec",
 "license": {
  "name": "CC BY 4.0",
  "url": "https://creativecommons.org/licenses/by/4.0/"
 },
 "usage": {
  "plugin": "Low",
  "affected_versions": "None seen",
  "as_of": "2026-10-14"
 }
}