In the past couple hours we have noticed strange voting behaviors coming from lots of accounts and it seems some app has been compromised.
I have personally revoked all authorized apps on my account until we figure out which one it is.
You can go here to revoke authorization from apps
https://v2.steemconnect.com/apps/authorized
I am sure there will updates later today
UPDATE: Seems that Utopian.io was hacked. So please revoke all posting access to Utopian until fixed