{
 "id": "WPSEC-2026-1147",
 "url": "https://wpsec.com/vuln/WPSEC-2026-1147/",
 "json_url": "https://wpsec.com/vuln/WPSEC-2026-1147/advisory.json",
 "markdown_url": "https://wpsec.com/vuln/WPSEC-2026-1147/index.md",
 "title": "Themify Builder <= 7.8.2 - Unauthenticated Arbitrary Mailing List Subscription via Optin Module",
 "description": "The Themify Builder plugin for WordPress is vulnerable to Improper Input Validation via the Optin module's tb_optin_subscribe AJAX action in all versions up to, and including, 7.8.2. This is due to the handler building the provider, list or form ID and double opt-in setting from user-supplied tb_optin_* POST parameters instead of the settings stored for the module. This makes it possible for unauthenticated attackers to subscribe arbitrary e-mail addresses to any list, audience or form in the mail service accounts configured on the site, and to skip the double opt-in confirmation the site owner turned on.",
 "plugin": {
  "slug": "themify-builder",
  "name": "Themify Builder",
  "full_name": "Themify Builder",
  "wordpress_org": "https://wordpress.org/plugins/themify-builder/",
  "advisories_url": "https://wpsec.com/vuln/plugin/themify-builder/",
  "attacksurface": "https://attacksurface.wpsec.com/plugin/themify-builder"
 },
 "type": "BYPASS",
 "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": null,
    "from_inclusive": true,
    "to": "7.8.3",
    "to_inclusive": false
   }
  ],
  "text": [
   "all versions before 7.8.3"
  ]
 },
 "introduced_in": null,
 "fixed_in": "7.8.3",
 "remediation": "Update to 7.8.3 or later.",
 "fix_released": "2026-10-16T03:13:53+00:00",
 "published": "2026-10-17T03:41:18+00:00",
 "updated": "2026-10-16T10:56:14.492713+00:00",
 "also_published_as": null,
 "references": [
  "https://wpsec.com/vuln/WPSEC-2026-1147/",
  "https://plugins.svn.wordpress.org/themify-builder/tags/7.8.3/",
  "https://wordpress.org/plugins/themify-builder/"
 ],
 "attacksurface_url": "https://attacksurface.wpsec.com/plugin/themify-builder",
 "source": "WPSec",
 "license": {
  "name": "CC BY 4.0",
  "url": "https://creativecommons.org/licenses/by/4.0/"
 },
 "usage": {
  "plugin": "Low",
  "affected_versions": "Low",
  "as_of": "2026-10-16"
 }
}