WebAPP before 0.9.9.5 passes (1) Unused Informations and (2) the username through Edit Profile forms, which has unknown impact and attack vectors.
http://www.web-app.org/cgi-bin/index.cgi?action=viewnews&id=250
http://www.vupen.com/english/advisories/2007/0604
http://www.securityfocus.com/bid/22563