MainWP Child – Securely Connects to the MainWP Dashboard to Manage Multiple Sites <= 6.2.1 - Unauthenticated PHP Object Injection via Clone/Restore Database Values
- ID
- WPSEC-2026-0460
- Plugin
- MainWP Child – Securely Connects to the MainWP Dashboard to Manage Multiple Sites (mainwp-child)
- Affected
- all versions before 6.2.2
- Remediation
- Update to 6.2.2 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness
- CWE-502
- Usage
- Plugin Medium · Affected versions Medium among sites WPSec scans, 2026-10-06
- 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 PHP Object Injection in all versions up to, and including, 6.2.1 via deserialization of untrusted input in the recursive_unserialize_replace function. When a site is cloned or restored, every serialized-looking value in the restored database is passed to unserialize() without restricting allowed classes. This makes it possible for unauthenticated attackers to place a serialized PHP object in a stored value they can write, such as a comment, which is instantiated when an administrator later clones or restores a backup containing that value. Impact depends on a POP chain being available through the site's installed plugins or themes, which could allow file deletion, sensitive data retrieval, or code execution.
References
- https://wpsec.com/vuln/WPSEC-2026-0460/
- https://plugins.svn.wordpress.org/mainwp-child/tags/6.2.2/
- https://wordpress.org/plugins/mainwp-child/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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