Board Thread:Support Requests - Getting Technical/@comment-7599283-20140619092542/@comment-2093602-20140619094745

Bureaucrats cannot edit pages in the MediaWiki space without also being an admin.

However, since bureaucrats can grant anyone (including themselves) admin rights, it is rare to see a bureaucrat that doesn't have the admins group.

But indeed if they don't have admin rights then the bureaucrat group itself won't allow them to edit MediaWiki pages.