The gigCalendar component for Joomla! and Mambo is prone to an SQL-injection vulnerability because it fails to sufficiently sanitize user-supplied data before using it in an SQL query. Exploiting this issue could allow an attacker to compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database. gigCalendar 1.0 is vulnerable other versions may also be affected. See http://www.securityfocus.com/bid/33863/ and http://joomlacode.org/gf/project/gigcalendar/ for further informations.

Successful exploitation will allow the attacker to view username and password of a registered user.

Update to newer version if available at http://joomlacode.org/gf/project/gigcalendar/, remove the gigCalendar component or set 'magic_quotes_gpc = On' in php.ini.