PUBLIC SERVICE ANNOUNCEMENT: Mass hack attack on Yahoo Mail accounts prompts password reset. “Attackers behind the cracking campaign used usernames and passwords that were probably collected from a compromised database belonging to an unidentified third party, according to Jay Rossiter, Yahoo senior vice president of platforms and personalization products, who wrote an advisory published Thursday. A large percentage of people use the same password to protect multiple Internet accounts, a practice that allows attackers holding credentials taken from one site to compromise accounts on other sites. There’s no evidence the passwords used in the attack came from Yahoo Systems.”