Mautic - SQL Injection via field Parameter in Lead-by-Field-Value AJAX Endpoint

Mautic's getLeadIdsByFieldValueAction (LeadBundle/Controller/AjaxController.php) reads a field parameter from the request, sanitizes it only with InputHelper::clean (which HTML-entity-encodes quotes and angle brackets but does not restrict other characters), and passes it into LeadRepository::buildQueryForGetLeadsByFieldValue where it is concatenated directly as a raw SQL column identifier ( = 'l.'.) rather than being validated against a whitelist of real column names or passed as a bound parameter.