Directory traversal vulnerability in htdocs/install/index.php in XOOPS 2.0.18 allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the lang parameter.
Open redirect vulnerability in htdocs/user.php in XOOPS 2.0.18 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a URL in the xoopsredirect parameter.