Yahoo! says their servers are still safe, however.
Late Thursday Yahoo! acknowledged hackers accessed a number of its Mail accounts through a third party and that the affected accounts must now reset their passwords. If you didn't know your Yahoo! Mail password, you're in luck.
In a post on the company blog, Yahoo! says their servers are still safe. But the company acknowledged hackers used a "third-party database compromise" to log in to multiple Yahoo! Mail accounts. The hackers seemed to target "names and email addresses from the affected accounts’ most recent sent emails," the company said. Yahoo! did not disclose how many accounts were affected.
In response the tech behemoth is forcing affected accounts to reset their passwords using two-step verification, if possible. The company also says it contacted federal law enforcement and "implemented additional measures to block attacks against Yahoo’s systems."