{
 "id": "WPSEC-2026-2126",
 "url": "https://wpsec.com/vuln/WPSEC-2026-2126/",
 "json_url": "https://wpsec.com/vuln/WPSEC-2026-2126/advisory.json",
 "markdown_url": "https://wpsec.com/vuln/WPSEC-2026-2126/index.md",
 "title": "MainWP Child – Securely Connects to the MainWP Dashboard to Manage Multiple Sites <= 6.3 - Missing Authorization to Branding Disconnected State Update via Site Registration",
 "description": "The MainWP Child plugin for WordPress is vulnerable to unauthorized modification of data via the site registration request in all versions up to, and including, 6.3, due to a missing authorization check in the register_site() function. On a site that is already connected, a registration request for any username that has password authentication enabled, or for a username that does not exist, sets the 'branding_disconnected' option to 'yes' before any credential is checked. This makes it possible for unauthenticated attackers to cancel the site's white-label branding settings (unless 'preserve branding' is enabled), which shows a plugin hidden by branding again and lifts the menu restrictions branding applies.",
 "plugin": {
  "slug": "mainwp-child",
  "name": "MainWP Child – Securely Connects to the MainWP Dashboard to Manage Multiple Sites",
  "full_name": "MainWP Child – Securely Connects to the MainWP Dashboard to Manage Multiple Sites",
  "wordpress_org": "https://wordpress.org/plugins/mainwp-child/",
  "advisories_url": "https://wpsec.com/vuln/plugin/mainwp-child/",
  "attacksurface": "https://attacksurface.wpsec.com/plugin/mainwp-child"
 },
 "type": "NO AUTHORISATION",
 "cwe": [
  "CWE-862"
 ],
 "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": "6.4",
    "to_inclusive": false
   }
  ],
  "text": [
   "all versions before 6.4"
  ]
 },
 "introduced_in": null,
 "fixed_in": "6.4",
 "remediation": "Update to 6.4 or later.",
 "fix_released": "2026-10-29T16:16:51+00:00",
 "published": "2026-10-30T16:43:49+00:00",
 "updated": "2026-10-30T09:24:12.737609+00:00",
 "also_published_as": null,
 "references": [
  "https://wpsec.com/vuln/WPSEC-2026-2126/",
  "https://plugins.svn.wordpress.org/mainwp-child/tags/6.4/",
  "https://wordpress.org/plugins/mainwp-child/"
 ],
 "attacksurface_url": "https://attacksurface.wpsec.com/plugin/mainwp-child",
 "source": "WPSec",
 "license": {
  "name": "CC BY 4.0",
  "url": "https://creativecommons.org/licenses/by/4.0/"
 },
 "usage": {
  "plugin": "Medium",
  "affected_versions": "Medium",
  "as_of": "2026-10-30"
 }
}