source: http://www.securityfocus.com/bid/43692/info

Rentventory is prone to multiple cross-site scripting vulnerabilities because the application fails to sufficiently sanitize user-supplied data.

Attacker-supplied HTML or JavaScript code could run in the context of the affected site, potentially allowing the attacker to steal cookie-based authentication credentials; other attacks are also possible.

Rentventory 1.0.1 is vulnerable; other versions may also be affected. 

http://www.example.com/index.php?Login=<script>alert(&#039;xss&#039;)</script>
http://www.example.com/index.php?Password=<script>alert(&#039;xss&#039;)</script>