MainWP Child – Securely Connects to the MainWP Dashboard to Manage Multiple Sites <= 6.3 - Missing Authorization to Branding Disconnected State Update via Site Registration
- ID
- WPSEC-2026-2126
- Plugin
- MainWP Child – Securely Connects to the MainWP Dashboard to Manage Multiple Sites (mainwp-child)
- Affected
- all versions before 6.4
- Remediation
- Update to 6.4 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness
- CWE-862
- Usage
- Plugin Medium · Affected versions Medium among sites WPSec scans, 2026-10-30
- Attack surface
- MainWP Child – Securely Connects to the MainWP Dashboard to Manage Multiple Sites on WPSec AttackSurface
- Fix released
- Published
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.
References
- https://wpsec.com/vuln/WPSEC-2026-2126/
- https://plugins.svn.wordpress.org/mainwp-child/tags/6.4/
- https://wordpress.org/plugins/mainwp-child/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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