Subscriber Broken Access Control in MainWP <= 6.1.1

Executive Summary

The WordPress MainWP Plugin versions 6.1.1 and earlier contain a Broken Access Control vulnerability (CVE-2026-57327). This means that unprivileged users can perform actions that should require higher privileges because the plugin lacks proper authorization, authentication, or nonce token checks.

This vulnerability is categorized as medium priority with a CVSS score of 6.3 and falls under the OWASP Top 10 category A1 (Broken Access Control).

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Impact Analysis

This vulnerability allows attackers or unprivileged users to perform higher-privileged actions on affected websites, potentially compromising the integrity, confidentiality, and availability of the site.

It is considered moderately dangerous and may be exploited in mass campaigns targeting thousands of websites, increasing the risk of widespread damage.

Immediate action is recommended to update the plugin to version 6.1.2 or later, or to apply mitigation measures such as blocking attacks via rules provided by Patchstack.

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Detection Guidance

The vulnerability allows unprivileged users to perform higher-privileged actions due to missing authorization, authentication, or nonce token checks. Detection typically involves monitoring for unauthorized access attempts or suspicious activity targeting the MainWP plugin versions 6.1.1 and earlier.

No specific detection commands or tools are provided in the available resources. It is recommended to monitor web server logs for unusual requests to the MainWP plugin endpoints and to use web application firewalls (WAF) with rules designed to detect broken access control attempts.

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Mitigation Strategies

Immediate mitigation steps include updating the MainWP plugin to version 6.1.2 or later, which contains the fix for this broken access control vulnerability.

If updating is not possible immediately, users should seek assistance from their hosting provider or web developer.

Additionally, Patchstack has provided a mitigation rule to block attacks targeting this vulnerability until the plugin can be updated.

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Compliance Impact

The vulnerability is a Broken Access Control issue that allows unprivileged users to perform higher-privileged actions due to missing authorization, authentication, or nonce token checks.

Such unauthorized access can lead to unauthorized disclosure, modification, or deletion of sensitive data, which may impact compliance with data protection standards and regulations like GDPR and HIPAA.

Because the vulnerability can be exploited in mass campaigns targeting thousands of websites, organizations using affected versions of the MainWP plugin may face increased risk of data breaches or unauthorized data access, potentially resulting in non-compliance with these regulations.

Immediate remediation by updating the plugin or applying mitigation measures is recommended to reduce the risk of compliance violations.

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