Executive Summary

The ProfileGrid – User Profiles, Groups and Communities plugin for WordPress has a vulnerability in all versions up to and including 5.9.8.1 where the function pg_delete_msg() does not check if the user has permission to delete a message.

Because of this missing capability check, any authenticated user with Subscriber-level access or higher can delete arbitrary messages belonging to any user by sending a direct request with a valid message ID.

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Impact Analysis

This vulnerability allows authenticated users with low-level access (Subscriber and above) to delete messages that do not belong to them.

The impact is limited to message integrity, as attackers can remove arbitrary messages, potentially disrupting communication or deleting important information.

The CVSS v3.1 base score is 4.3, indicating a low to medium severity with no confidentiality or availability impact but with integrity impact.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability allows authenticated users with Subscriber-level access or higher to delete arbitrary messages by sending a direct request with a valid message ID (mid parameter) to the vulnerable function pg_delete_msg().'}, {'type': 'paragraph', 'content': "Detection can be performed by monitoring HTTP requests to the WordPress site for suspicious POST or AJAX requests targeting the message deletion endpoint, especially those including the 'mid' parameter."}, {'type': 'paragraph', 'content': 'Since the vulnerability involves unauthorized message deletion via AJAX calls, you can look for unusual or unexpected AJAX requests that delete messages without proper authorization.'}, {'type': 'list_item', 'content': "Use web server access logs to search for requests containing 'mid=' parameter in POST data or query strings to the ProfileGrid plugin endpoints."}, {'type': 'list_item', 'content': 'Example command to search Apache/Nginx logs for suspicious message deletion attempts:'}, {'type': 'list_item', 'content': "grep -i 'mid=' /var/log/apache2/access.log"}, {'type': 'list_item', 'content': "grep -i 'mid=' /var/log/nginx/access.log"}, {'type': 'paragraph', 'content': 'Additionally, monitoring AJAX requests in browser developer tools or using network monitoring tools to detect unauthorized message deletion attempts can help.'}, {'type': 'paragraph', 'content': 'Look for failed or successful AJAX calls to the message deletion endpoint without proper nonce or capability checks, which were missing in vulnerable versions.'}] [4]

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Mitigation Strategies

The immediate mitigation step is to update the ProfileGrid – User Profiles, Groups and Communities WordPress plugin to version 5.9.8.2 or later, where the vulnerability has been fixed.

The update includes strict authorization checks, nonce verification for CSRF protection, input sanitization, and secure AJAX handling to prevent unauthorized message deletion.

If updating immediately is not possible, consider temporarily restricting access to the message deletion AJAX endpoint to trusted users only or disabling the messaging feature until the patch can be applied.

Monitor logs for suspicious activity as described in detection steps and alert administrators if unauthorized deletion attempts are detected.

Ensure that user roles and permissions are properly configured to minimize the risk of abuse by lower-privileged users.

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