Unauthenticated Account Takeover in MainWP Child WordPress Plugin

Executive Summary

This vulnerability affects the MainWP Child WordPress plugin versions before 6.1.2. It allows an unauthenticated attacker to bypass authentication and gain administrator access by exploiting a flaw in the site-registration request handler when password authentication is disabled. The attacker can obtain a valid session by submitting a single registration request with the target account's login name.

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Detection Guidance

Check if your MainWP Child plugin version is below 6.1.2 by inspecting the plugin files or WordPress admin panel. Look for unauthorized administrator accounts or unexpected registration requests in server logs.

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Impact Analysis

An attacker could gain full control of your WordPress site by exploiting this vulnerability, allowing them to install malicious plugins, steal data, or deface your website. Since it bypasses authentication, even accounts with password authentication disabled are vulnerable.

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Compliance Impact

This vulnerability could lead to unauthorized access and data breaches, violating GDPR and HIPAA requirements for data protection and access control. Organizations may face fines or legal consequences if this flaw is exploited and sensitive data is compromised.

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Mitigation Strategies

Update the MainWP Child plugin to version 6.1.2 or later immediately. Disable password authentication for accounts if not required and monitor for suspicious activity.

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