e107 2.1.2 allows PHP Object Injection with resultant SQL injection, because usersettings.php uses unserialize without an HMAC.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2016-1747
https://demo.ripstech.com/projects/e107_2.1.2
https://blog.ripstech.com/2016/e107-sql-injection-through-object-injection/