What can I do to avoid this?

[kanyokuo]

Hi,

Currently when user A have created 'hello.com', user B does have the opportunity to create the subdomain 'sub.hello.com'. Is this a bug or something, because you can just create a subdomain from another user's domain.

What can I do to avoid this?

[grayfolk]

Hi,

Currently when user A have created 'hello.com', user B does have the opportunity to create the subdomain 'sub.hello.com'. Is this a bug or something, because you can just create a subdomain from another user's domain.

What can I do to avoid this?

This is Vesta principle. Vesta not have a notion called "subdomain", "domain" only. So, hello.com - domain, sub.hello.com - domain too.