Executive Summary

This vulnerability exists in the ProfilePress WordPress plugin (including Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content) up to version 4.16.7. It allows authenticated users with Subscriber-level access or higher to execute arbitrary shortcodes via the 'pp_preview_form' endpoint due to insufficient input sanitization on the 'type' parameter in the form preview functionality.

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Impact Analysis

An attacker with Subscriber-level access or above can exploit this vulnerability to execute arbitrary shortcodes, which may lead to unauthorized actions such as information disclosure or modification of content within the WordPress site. This could compromise the integrity and confidentiality of the site data.

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Detection Guidance

You can detect this vulnerability by checking if your WordPress installation is running the ProfilePress plugin (also known as WP User Avatar) at version 4.16.7 or earlier. Specifically, look for the presence of the `pp_preview_form` endpoint and attempts to access it with the `type` parameter. Monitoring web server logs for authenticated users (Subscriber-level and above) making requests to `pp_preview_form` with unusual or suspicious shortcode payloads can help identify exploitation attempts. There are no specific commands provided in the resources, but you can use tools like `grep` on your web server logs to search for `pp_preview_form` requests, for example: `grep 'pp_preview_form' /var/log/apache2/access.log` or `grep 'pp_preview_form' /var/log/nginx/access.log`. Additionally, checking the plugin version via WordPress admin or command line (WP-CLI) can help: `wp plugin list | grep profilepress`. [2, 3]

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Mitigation Strategies

The immediate mitigation step is to update the ProfilePress (WP User Avatar) plugin to version 4.16.8 or later, where the vulnerability has been fixed. The fix restricts form preview access strictly to administrators, validates and sanitizes input parameters, and ensures only authorized users can execute shortcodes via the form preview functionality. If updating immediately is not possible, restrict access to the `pp_preview_form` endpoint to trusted administrator users only, and consider disabling the form preview feature temporarily. Also, review user roles and permissions to ensure that Subscriber-level users do not have elevated privileges that could be exploited. [2, 3]

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