PHP remote file inclusion vulnerability in admin/index.php in Fusion Polls allows remote attackers to execute arbitrary PHP code via a URL in the xtrphome parameter.
Fusion News 3.6.1 allows remote attackers to add user accounts, if the administrator is logged in, via a comment that contains an img bbcode tag that calls index.php with the signup action, which is executed when the administrator's browser loads the page with the img tag.