Copyright Proof <= 4.16 - Reflected Cross-Site-Scripting

The plugin does not sanitise and escape a parameter before outputting it back via an AJAX action available to both unauthenticated and authenticated users, leading to a Reflected Cross-Site Scripting when a specific setting is enabled.

PoC

To make it easier to verify the vulnerability without the need of registering an account within the plugin’s settings, set the “dprv_record_IP” option to “on” in the database: UPDATE wp_options SET option_value = ‘on’ WHERE option_name = ‘dprv_record_IP’; https://example.com/wp-admin/admin-ajax.php?action=dprv_log_event&amp;message;=<script>alert(`xss`)</script>