A group of Hackers identified as D33Ds published more than 450,000 Yahoo users logins online.

According to the Web page where the documents were posted the hack was meant to be a warning and not a threat.

“We hope that the parties responsible for managing the security of this subdomain will take this as a wake-up call, and not as a threat,” read the note. “There have been many security holes exploited in Web servers belonging to Yahoo! Inc. that have caused far greater damage than our disclosure. Please do not take them lightly.”

In a statement Yahoo! apologized and urged users to change their passwords.

“At Yahoo! we take security very seriously and invest heavily in protective measures to ensure the security of our users and their data across all our products,” the statement said. “We are fixing the vulnerability that led to the disclosure of this data, changing the passwords of the affected Yahoo! users and notifying the companies whose users accounts may have been compromised.”

Need to change your password? Check out the image below for step by step directions: