The hardworking people in your company's IT department never intended for your actual password to be "guest" or "12345." If you leave that default password in place, you've unwittingly created a backdoor. Change it as soon as possible and enable multi-factor authentication (MFA) while you're at it. Yes, keeping track of a unique password for every application can be daunting. A Malwarebytes Labs report on data privacy found that 29 percent of respondents used the same password across numerous apps and devices. Not bad, but there's still room for improvement.