{
 "id": "WPSEC-2026-1351",
 "url": "https://wpsec.com/vuln/WPSEC-2026-1351/",
 "json_url": "https://wpsec.com/vuln/WPSEC-2026-1351/advisory.json",
 "markdown_url": "https://wpsec.com/vuln/WPSEC-2026-1351/index.md",
 "title": "Popup Builder <= 4.4.5 - Unauthenticated Stored Cross-Site Scripting via Subscription Form Name Fields",
 "description": "The Popup Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the subscription form first name and last name fields in versions 4.1.1 through 4.4.5, due to insufficient input sanitization and output escaping. Names were stored after sanitize_text_field() only, which keeps a '<' followed by whitespace, and were printed on the admin Subscribers page through wp_kses() with an allowlist that permits script tags and onclick attributes, so the stored text becomes a real tag again. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute when an administrator views the Subscribers page.",
 "plugin": {
  "slug": "popup-builder",
  "name": "Popup Builder",
  "full_name": "Popup Builder – Create highly converting, mobile friendly marketing popups.",
  "wordpress_org": "https://wordpress.org/plugins/popup-builder/",
  "advisories_url": "https://wpsec.com/vuln/plugin/popup-builder/",
  "attacksurface": "https://attacksurface.wpsec.com/plugin/popup-builder"
 },
 "type": "XSS",
 "cwe": [
  "CWE-79"
 ],
 "cve": [],
 "cvss": {
  "version": "3.1",
  "score": 7.2,
  "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
  "severity": "High"
 },
 "affected": {
  "ranges": [
   {
    "from": "4.1.1",
    "from_inclusive": true,
    "to": "4.4.6",
    "to_inclusive": false
   }
  ],
  "text": [
   "from 4.1.1 before 4.4.6"
  ]
 },
 "introduced_in": "4.1.1",
 "fixed_in": "4.4.6",
 "remediation": "Update to 4.4.6 or later.",
 "fix_released": "2026-10-19T16:04:57+00:00",
 "published": "2026-10-21T12:44:50+00:00",
 "updated": "2026-10-21T12:33:25.482806+00:00",
 "also_published_as": null,
 "references": [
  "https://wpsec.com/vuln/WPSEC-2026-1351/",
  "https://plugins.svn.wordpress.org/popup-builder/tags/4.4.6/",
  "https://wordpress.org/plugins/popup-builder/"
 ],
 "attacksurface_url": "https://attacksurface.wpsec.com/plugin/popup-builder",
 "source": "WPSec",
 "license": {
  "name": "CC BY 4.0",
  "url": "https://creativecommons.org/licenses/by/4.0/"
 },
 "usage": {
  "plugin": "High",
  "affected_versions": "Medium",
  "as_of": "2026-10-21"
 }
}