The vulnerability stems from missing authorization checks in both the AJAX endpoint handler (ViewAjaxController::ajaxView) and its route configuration. The controller method processes AJAX requests without validating whether the targeted view was explicitly configured to use AJAX, while the route's access controls failed to enforce this requirement. This combination allowed unauthorized access to views' AJAX endpoints regardless of their configuration. The high confidence comes from Drupal's architecture where route definitions and controller methods are primary points for access control, and the CVE description explicitly implicates the views subsystem's failure to restrict AJAX endpoint access.