If your company has experienced a data breach, it’s probably a good idea to thoroughly investigate it promptly.Unfortunately, Yahoo didn’t, according to a new internal investigation.

The internet pioneer, which reported a massive data breach involving 500 million user accounts in September, actually knew an intrusion had occurred back in 2014, but allegedly botched its response.[ 18 surprising tips for security pros. | Discover how to secure your systems with InfoWorld’s Security Report newsletter. ]
The findings were made in a Yahoo securities exchange filing on Wednesday that offered more details about the 2014 breach, which the company has blamed on a state-sponsored hacker.To read this article in full or to leave a comment, please click here

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