SQL Injection exists in the Music Collection 3.0.3 component for Joomla! via the id parameter.
https://www.exploit-db.com/exploits/45465/
https://euvd.enisa.europa.eu/vulnerability/EUVD-2018-9129
http://packetstormsecurity.com/files/149521/Joomla-Music-Collection-3.0.3-SQL-Injection.html