Dell announced that they detected attackers in their systems on November 9th 2018 who were attempting to extract customer information from the Dell.com, Premier, Global Portal and support.dell.com sites.
According to Dell’s breach notification, they detected unauthorized users in their systems on November 9th 2018. These attackers were trying to retrieve customers information from Dell.com accounts that included names, email addresses, and hashed passwords. While their investigation did not reveal that any information was stolen, Dell decided to perform a mandatory reset on all Dell.com accounts. These password resets will occur when the user next logs in.
Read more about the cyberattack targeting Dell on BleepingComputer.