If you didn't change the root password to your Modem/router, please do that now.
Not the wifi password, the password to the admin/settings area.
It's not hacking if the password was password, or even worse abc123. 😆
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Admin/admin counts
Definitely. Except in your case, because you told us.
Or if was in some algorithmically generated database where you could brute force generate valid combos using easy to obtain information.