phpGraphy 0.9.11 and earlier allows remote attackers to bypass authentication and gain administrator privileges via a direct request to index.php with the editwelcome parameter set to 1, which can then be used to modify the main page to inject arbitrary HTML and web script. NOTE: XSS attacks are resultant from this issue, since normal functionality allows the admin to modify pages.
https://exchange.xforce.ibmcloud.com/vulnerabilities/25892
http://www.vupen.com/english/advisories/2006/1379
http://www.securityfocus.com/archive/1/431268/100/0/threaded
http://www.securityfocus.com/archive/1/431128/100/0/threaded
http://securitytracker.com/id?1015971