Do all JIRA users can access my free scrum or kanban board?

[Zenman]

When I created a JIRA board in free plan, I went to permissions and wanted to see who has permission or allowed to open my board and see the contents, I found out that i cannot edit as I use the free registeration. So now my questions are: 

Does this "any logged-in user is an admin" mean that anyone who has an account in atlassian jira can read the content in my board?

Also, does "Application access Any logged in user" mean that anyone who has an account in atlassian jira can read the content of my board and can access it?

Well, I tied to find other boards, but I could not find any.

[Nic Brough -Adaptavist-]

"any logged in user" means what it says - if a person can log into your system, then they have the permission to do what that that "role" is named for.  If that permission is a "browse project" permission, then yes, anyone who logs in can see that project.

It does not mean anyone with an Atlassian account (there are millions of us!).  It only means people who have the ability to log into your system.

[Amaro Anthony]

This really needs to be made more clear in the documentation. "Any logged in user" is really ambiguous. It could mean anyone with an atlassian account. "Your system" is ambiguous too, as we don't have systems with atlassian, we have accounts.