This is serious. If you have Ubiquiti equipment do change your credentials immediately and check for signs of compromise.
Adam says the attacker(s) had access to privileged credentials that were previously stored in the LastPass account of a Ubiquiti IT employee, and gained root administrator access to all Ubiquiti AWS accounts, including all S3 data buckets, all application logs, all databases, all user database credentials, and secrets required to forge single sign-on (SSO) cookies.
Source: Whistleblower: Ubiquiti Breach “Catastrophic” — Krebs on Security