{
 "id": "WPSEC-2026-2850",
 "url": "https://wpsec.com/vuln/WPSEC-2026-2850/",
 "json_url": "https://wpsec.com/vuln/WPSEC-2026-2850/advisory.json",
 "markdown_url": "https://wpsec.com/vuln/WPSEC-2026-2850/index.md",
 "title": "Kit (formerly ConvertKit) – Email Subscribers, Email Newsletter, Email Marketing, Landing Pages and Membership <= 3.5.0 - Unauthenticated Sensitive Information Exposure via Restricted Post Attachments",
 "description": "The Kit (formerly ConvertKit) plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 3.5.0 due to the Member Content feature not restricting attachments of restricted pages and posts in the REST API and on attachment pages. This makes it possible for unauthenticated attackers to obtain the file URLs of media attached to member-only content and access those files.",
 "plugin": {
  "slug": "convertkit",
  "name": "Kit (formerly ConvertKit) – Email Subscribers, Email Newsletter, Email Marketing, Landing Pages and Membership",
  "full_name": "Kit (formerly ConvertKit) – Email Subscribers, Email Newsletter, Email Marketing, Landing Pages and Membership",
  "wordpress_org": "https://wordpress.org/plugins/convertkit/",
  "advisories_url": "https://wpsec.com/vuln/plugin/convertkit/",
  "attacksurface": "https://attacksurface.wpsec.com/plugin/convertkit"
 },
 "type": "SENSITIVE DATA DISCLOSURE",
 "cwe": [
  "CWE-200"
 ],
 "cve": [],
 "cvss": {
  "version": "3.1",
  "score": 5.3,
  "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
  "severity": "Medium"
 },
 "affected": {
  "ranges": [
   {
    "from": "2.1.0",
    "from_inclusive": true,
    "to": "3.5.1",
    "to_inclusive": false
   }
  ],
  "text": [
   "from 2.1.0 before 3.5.1"
  ]
 },
 "introduced_in": "2.1.0",
 "fixed_in": "3.5.1",
 "remediation": "Update to 3.5.1 or later.",
 "fix_released": "2026-11-10T06:14:36+00:00",
 "published": "2026-11-12T17:52:14+00:00",
 "updated": "2026-11-12T17:04:38.899439+00:00",
 "also_published_as": null,
 "references": [
  "https://wpsec.com/vuln/WPSEC-2026-2850/",
  "https://plugins.svn.wordpress.org/convertkit/tags/3.5.1/",
  "https://wordpress.org/plugins/convertkit/"
 ],
 "attacksurface_url": "https://attacksurface.wpsec.com/plugin/convertkit",
 "source": "WPSec",
 "license": {
  "name": "CC BY 4.0",
  "url": "https://creativecommons.org/licenses/by/4.0/"
 },
 "usage": {
  "plugin": "Medium",
  "affected_versions": "Medium",
  "as_of": "2026-11-12"
 }
}