Security implications
If you have administrator privileges, you can configure your application to subscribe to gadgets from other Atlassian applications. When you subscribe to gadgets from another application, people will be able to use all those gadgets in your application. The gadgets are those provided by the other application or via plugins installed into that application. They do not include external gadgets that the other application has added to its directory.
To subscribe to gadgets from another application,
Screenshot 1: Gadget directory with 'Add Gadget to Directory' button
Screenshot 2: Adding a gadget to the directory