A potential security issue exists in FileCloud version 184.108.40.20659, released on December 21, 2020.
When a group was denied access to a shared team folder's sub-folders, but a single user from the group was given access, the other users in the group could view sub-folder names. This has been fixed.
In version 220.127.116.1194, this has been fixed so that users who were not given access to the sub-folders cannot see the sub-folder names.
If you are using the FileCloud on-premise installation, please update it to the latest version, which is 18.104.22.16894 or greater.
If you are using FileCloud online, your site has already been updated to the latest version.