As you know a security issue was reported 10 November. Digitanium and the dev team have been working on the issue and a fix is now available for v7. We have yet to discover v6's flaw at this time but we believe it may be a non-core infusion.
Anyway, v7 users, a small update pack has been released. Simply extract the files and overwrite your existing files. Then go to Upgrade in your Admin Panel and follow the prompts.
The SVN and full download package have also been updated.
Please note: While activating new accounts I usually check them out. If I notice an account registered with a temporary email address it will be deleted.