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Nelson and others were able to get into the Ring accounts by illicitly obtaining usernames and passwords for Yahoo email accounts and identifying individuals who used the same credentials for their Ring home security systems.

"In the absence of certainty, it would certainly be advisable for M&S customers, particularly those who may have reused their M&S account credentials on other web services, to begin changing those passwords elsewhere."

This ranges from conducting reconnaissance to identify vulnerable systems, to analysing code for flaws or suggesting possible passwords to break into systems.

Some of the product’s features, such as its safe browsing mode or a system that notifies users if their password has been compromised, rely on shared Google infrastructure not solely within Chrome’s purview, she said.

The password sharing crackdown has come for Max users.