source: https://www.securityfocus.com/bid/27127/info
Nucleus CMS is prone to an SQL-injection weakness because it fails to sufficiently sanitize user-supplied data before using it in an SQL query.
Attackers can exploit this issue in conjunction with other weaknesses in the application to bypass CAPTCHA security checks. Other attacks may also be possible.
Nucleus CMS 3.01 is vulnerable; other versions may also be affected.
MoBiC-20 Bonus: another Nucleus CAPTCHA bypass exploit (C) 2007 MustLive. http://websecurity.com.ua