Obviously, changing your password to a site that has been breached can go a long way to safeguarding your cybersecurity . . . on that site. Because, consider this: Hackers aggregate their breach data, and every bit of data from each breach—even if it’s just your username and your password (which you have subsequently changed)—helps hackers create a more complete profile of you. All of this information, when aggregated, is your digital footprint.
Like a mosaic–in which separate, individual tiles have little value but in the aggregate form a complete picture–individual bits of data may have limited value, but taken together pose a very real threat to your cybersecurity. And when that data is breached from online accounts and corporate databases and made available to bad actors (hackers) . . . you’ve been pwned.