Executive Summary

The LatePoint plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in all versions up to and including 5.5.0. This occurs because the plugin does not properly sanitize input on the customer cabinet profile update endpoint. Specifically, raw POST parameters such as first_name, last_name, phone, and notes bypass sanitization due to the OsCustomerModel not overriding the params_to_sanitize() method. As a result, unsanitized data is stored directly in the database.

Additionally, when generating notification previews, the plugin injects these stored unsanitized values into HTML templates without escaping them properly. This allows authenticated users with customer-level access or higher to inject arbitrary scripts that execute in the browsers of administrators or agents when they preview notification templates referencing customer variables like {{customer_full_name}}, {{customer_first_name}}, {{customer_last_name}}, {{customer_phone}}, or {{customer_notes}}.

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Impact Analysis

This vulnerability can allow an authenticated attacker with customer-level access to inject malicious scripts into the WordPress admin notification preview panel. These scripts execute in the browsers of administrators or agents, potentially leading to unauthorized actions such as session hijacking, data theft, or manipulation of the admin interface.

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Mitigation Strategies

To mitigate this vulnerability, you should update the LatePoint plugin for WordPress to a version later than 5.5.0 where the issue is fixed.

Since the vulnerability arises from insufficient input sanitization and output escaping, avoid using the customer cabinet profile update endpoint to input untrusted data until patched.

Additionally, restrict customer-level access to trusted users only, as the exploit requires authenticated customer-level access or above.

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