As of Elgg 3.0 several hardening settings have been added to Elgg. You can enable/disable these settings as you like.
The URL of http://your-elgg-site.com/upgrade.php can be protected by a unique token. This will prevent random users from being able to run this file. The token is not needed for logged in site administrators.
The URLs of the cron can be protected by a unique token. This will prevent random users from being able to run the cron. The token is not needed when running the cron from the commandline of the server.
Data entered in these fields will be cached by the browser. An attacker who can access the victim’s browser could steal this information. This is especially important if the application is commonly used in shared computers such as cyber cafes or airport terminals. If you disable this, password management tools can no longer autofill these fields. The support for the autocomplete attribute can be browser specific.
When a user wishes to change their email address associated with their account, they need to also supply their current password.
When a new site administrator is added or when a site administrator is removed all the site administrators get a notification about this action.