The installation wizard in DotNetNuke (DNN) before 7.4.1 allows remote attackers to reinstall the application and gain SuperUser access via a direct request to Install/InstallWizard.aspx.
https://dotnetnuke.codeplex.com/releases/view/615317
http://www.securityfocus.com/bid/96373
http://www.dnnsoftware.com/community/security/security-center
http://www.dnnsoftware.com/community-blog/cid/155198/workaround-for-potential-security-issue