Centreon 3.4.x (fixed in Centreon 18.10.0) has XSS via the resource name or macro expression of a poller macro.
Centreon 3.4.x (fixed in Centreon 18.10.0) allows XSS via the Service field to the main.php?p=20201 URI, as demonstrated by the "Monitoring > Status Details > Services" screen.
Centreon 3.4.x (fixed in Centreon 18.10.0 and Centreon web 2.8.24) allows SQL Injection via the searchVM parameter to the main.php?p=20408 URI.