phpList -- SQL injection and XSS vulnerability

Zero Science Lab reports:

Input passed via the parameter ‘sortby’ is not properly
sanitised before being returned to the user or used in SQL queries.
This can be exploited to manipulate SQL queries by injecting
arbitrary SQL code. The param ‘num’ is vulnerable to a XSS issue
where the attacker can execute arbitrary HTML and script code in
a user’s browser session in context of an affected site.