source: http://www.securityfocus.com/bid/25458/info

PhpGedView is prone to a cross-site scripting vulnerability because it fails to properly sanitize user-supplied input.

Exploiting this vulnerability may allow an attacker to perform cross-site scripting attacks on unsuspecting users in the context of the affected website. As a result, the attacker may be able to steal cookie-based authentication credentials and to launch other attacks.

PhpGedView 4.1 is vulnerable; other versions may also be affected. 

http://www.example.com/genealogy/login.php?action=login&username=[xss] 