Gjoko Krstic has discovered a vulnerability in Baby Gekko, which can be exploited by malicious people to conduct cross-site scripting attacks.
Input appended to the URL after admin/index.php is not properly sanitised in admin/login.php before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.
The vulnerability is confirmed in version 1.1.5c. Other versions may also be affected.