XenForo 2.0.9 is now available for download, which aims to solve a security problem due to a potential vulnerability (XSS) that the developers have discovered. We recommend that all users working with XenForo 2.0 upgrade to version 2.0.9 as soon as possible. If you don't want to completely update the release, you can just install a security patch for yourself by replacing the old files on FTP with new ones.