{
 "id": "WPSEC-2026-2903",
 "url": "https://wpsec.com/vuln/WPSEC-2026-2903/",
 "json_url": "https://wpsec.com/vuln/WPSEC-2026-2903/advisory.json",
 "markdown_url": "https://wpsec.com/vuln/WPSEC-2026-2903/index.md",
 "title": "s2Member <= 261106 - Unauthenticated Stored Cross-Site Scripting via PayPal Return Tracking Codes",
 "description": "The s2member plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the PayPal return-page tracking codes feature (Signup, Modification, Capability and Specific Post/Page tracking codes) in all versions up to, and including, 261106, due to insufficient sanitization of payer-supplied PayPal values (such as first name, last name, payer email, item name and custom values) inserted into the tracking code template, and the stored result being output through do_shortcode() without escaping. This makes it possible for unauthenticated attackers who complete a PayPal payment to inject arbitrary web scripts or shortcodes that run in the browser that processes the payment's return link, for example a user tricked into opening that link. Exploitation requires tracking codes with the affected placeholders to be configured.",
 "plugin": {
  "slug": "s2member",
  "name": "s2Member",
  "full_name": "s2Member – Excellent for All Kinds of Memberships, Content Restriction Paywalls & Member Access Subscriptions",
  "wordpress_org": "https://wordpress.org/plugins/s2member/",
  "advisories_url": "https://wpsec.com/vuln/plugin/s2member/",
  "attacksurface": "https://attacksurface.wpsec.com/plugin/s2member"
 },
 "type": "XSS",
 "cwe": [
  "CWE-79"
 ],
 "cve": [],
 "cvss": {
  "version": "3.1",
  "score": 4.7,
  "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N",
  "severity": "Medium"
 },
 "affected": {
  "ranges": [
   {
    "from": null,
    "from_inclusive": true,
    "to": "261110",
    "to_inclusive": false
   }
  ],
  "text": [
   "all versions before 261110"
  ]
 },
 "introduced_in": null,
 "fixed_in": "261110",
 "remediation": "Update to 261110 or later.",
 "fix_released": "2026-11-10T06:19:14+00:00",
 "published": "2026-11-12T17:52:14+00:00",
 "updated": "2026-11-12T17:08:56.863446+00:00",
 "also_published_as": null,
 "references": [
  "https://wpsec.com/vuln/WPSEC-2026-2903/",
  "https://plugins.svn.wordpress.org/s2member/tags/261110/",
  "https://wordpress.org/plugins/s2member/"
 ],
 "attacksurface_url": "https://attacksurface.wpsec.com/plugin/s2member",
 "source": "WPSec",
 "license": {
  "name": "CC BY 4.0",
  "url": "https://creativecommons.org/licenses/by/4.0/"
 },
 "usage": {
  "plugin": "Low",
  "affected_versions": "Low",
  "as_of": "2026-11-12"
 }
}