“We are not currently aware of evidence of access to any databases that host user data, but we cannot be certain that user data has not been exposed.”
Ubiquiti’s systems at a third-party cloud provider were breached, and the company can’t say what was taken. Names, emails, password hashes, addresses and phone numbers may be gone. The notice went out as a Mailchimp marketing email. Change your password, and ask why your router needed a cloud account in the first place.