Here’s yet another reminder of why it’s a bad idea to use the same password on more than one site.
According to the Dropbox blog, “The usernames and passwords referenced in these articles were stolen from unrelated services, not Dropbox. Attackers then used these stolen credentials to try to log in to sites across the internet, including Dropbox.”
If you have trouble remembering a different password for every site, one option is to use a password manager. Password managers are not impervious to all types of attacks, but they can help to ensure that you have different, strong, and unique passwords for every online service.