"Using MD5" !? What year are we in again?

NOTICE OF DATA BREACH

Dear Yahoo User,
We are writing to inform you about a data security issue that may involve your Yahoo account information. We have taken steps to secure your account and are working closely with law enforcement.
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What Information Was Involved?

The stolen user account information may have included names, email addresses, telephone numbers, dates of birth, hashed passwords (using MD5)