source: https://www.securityfocus.com/bid/15563/info

Comdev Vote Caster is prone to an SQL injection vulnerability. This issue is due to a failure in the application to properly sanitize user-supplied input 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.

Version 3.1 and earlier are affected; other versions may also be vulnerable. 

http://www.example.com/index.php?pageaction=results&campaign_id=[SQL]