May 26 notification posted to community.netgear.com. Here’s how it begins:
Dear Arlo Customer:
We have recently observed suspicious activity potentially impacting Arlo accounts. We take the privacy and security of your account and personal information very seriously and have initiated an investigation into the suspicious activity. From our initial investigation, it appears that attackers may be using credentials obtained from an unknown third-party in an attempt to gain unauthorized access to Arlo accounts. At this stage,we have no reason to believe our own systems have been impacted.
As a precautionary measure, we are recommending that all Arlo customers change their Arlo account password immediately.
The remained of the notice tells customers how to make the password change.