The details for these two issues can be found here on the Secunia site:

Secunia Research has discovered two vulnerabilities in CMS Mundo, which can be exploited by malicious people to conduct SQL injection attacks and compromise a vulnerable system.

Input passed to the "username" parameter in "controlpanel/" during login isn't properly sanitised before being used in a SQL query. This can be exploited to manipulate SQL queries by injecting arbitrary SQL code.

An input validation error in the image upload handling in the image gallery can be exploited to upload arbitrary PHP scripts to a predictable location inside the web root.

There is already a patch (version 1.0 build 008) for this issue, and all users of CMS Mundo are encouraged to update immediately so as not to fall victim to these issues.