Users should also consider enabling two-step authentication on their Yahoo accounts, to provide an extra and very strong level of security. Yahoo is advising users to change their passwords and security questions and answers for any other accounts in which they used the same or similar information as with their Yahoo account. They must also remain vigilant about the possibility of pile-on attacks in the coming days and weeks. The company has posted examples of what that email looks like on its site.Įxperts say users should be proactive and take steps to protect themselves.

Avoid clicking on links or downloading attachments from such suspicious emails,' the company said. 'If an email you receive about these issues prompts you to click on a link, download an attachment, or asks you for information, the email was not sent by Yahoo and may be an attempt to steal your personal information. They also won't contain attachments and never request users' personal information, the company says. Phishing emails from crooks masquerading as Yahoo may asks users to click on links. Look carefully. Not all emails that look like they come from Yahoo are legit. It's also sending possibly affected users email. Yahoo is reaching out to users, advising them to change passwords and upgrade their security. That comes on top of a breach involving as many as 500 million Yahoo users that the company reported in September of this year but which took place in 2014. The Internet company said late Wednesday as many as 1 billion user accounts may have been compromised in a breach that took place in August 2013.

But beware: this is prime time for scammers to prey. SAN FRANCISCO - Yahoo user? Be ready to refresh your account passwords. Watch Video: Tech 101 - How to protect yourself from phishing scams

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