{
 "id": "WPSEC-2026-2313",
 "url": "https://wpsec.com/vuln/WPSEC-2026-2313/",
 "json_url": "https://wpsec.com/vuln/WPSEC-2026-2313/advisory.json",
 "markdown_url": "https://wpsec.com/vuln/WPSEC-2026-2313/index.md",
 "title": "hCaptcha for WP <= 5.4.1 - Unauthenticated CAPTCHA Bypass via MailPoet Subscription Requests",
 "description": "The hCaptcha for WP plugin for WordPress is vulnerable to a protection mechanism bypass via the MailPoet integration in all versions up to, and including, 5.4.1. This is due to the subscription check matching only the exact POST values action=mailpoet, endpoint=subscribers and method=subscribe, while MailPoet dispatches on the request action, trims and normalizes the endpoint and method names, and accepts the 'mailpoet_method' alias, and to MailPoet's admin-post subscription handler (mailpoet_subscription_form) not being checked at all. This makes it possible for unauthenticated attackers to subscribe addresses to MailPoet lists without solving the hCaptcha challenge.",
 "plugin": {
  "slug": "hcaptcha-for-forms-and-more",
  "name": "hCaptcha for WP",
  "full_name": "hCaptcha for WP",
  "wordpress_org": "https://wordpress.org/plugins/hcaptcha-for-forms-and-more/",
  "advisories_url": "https://wpsec.com/vuln/plugin/hcaptcha-for-forms-and-more/",
  "attacksurface": "https://attacksurface.wpsec.com/plugin/hcaptcha-for-forms-and-more"
 },
 "type": "BYPASS",
 "cwe": [
  "CWE-693"
 ],
 "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": "5.5.0",
    "to_inclusive": false
   }
  ],
  "text": [
   "all versions before 5.5.0"
  ]
 },
 "introduced_in": null,
 "fixed_in": "5.5.0",
 "remediation": "Update to 5.5.0 or later.",
 "fix_released": "2026-10-30T14:21:57+00:00",
 "published": "2026-11-03T14:48:33+00:00",
 "updated": "2026-11-03T13:38:53.736396+00:00",
 "also_published_as": null,
 "references": [
  "https://wpsec.com/vuln/WPSEC-2026-2313/",
  "https://plugins.svn.wordpress.org/hcaptcha-for-forms-and-more/tags/5.5.0/",
  "https://wordpress.org/plugins/hcaptcha-for-forms-and-more/"
 ],
 "attacksurface_url": "https://attacksurface.wpsec.com/plugin/hcaptcha-for-forms-and-more",
 "source": "WPSec",
 "license": {
  "name": "CC BY 4.0",
  "url": "https://creativecommons.org/licenses/by/4.0/"
 },
 "usage": {
  "plugin": "Medium",
  "affected_versions": "Medium",
  "as_of": "2026-11-03"
 }
}