Due to a security vulnerability discovered in forms-based authentication:
ALL USERS ARE STRONGLY ENCOURAGED TO UPGRADE
To upgrade:
If you are running any 6.4 or later release, click 'Check for Updates' on the Tools/Update OS page.
If you are running a pre-6.4 release, click 'Check for Updates' on the Plugins page.
If the above doesn't work, navigate to Plugins/Install Plugin, select/copy/paste this plugin URL and click Install:
https://s3.amazonaw