Event Details

Hackers Used Yahoo's Own Software Against It in Data Breach


Wall Street Journal, December 15, 2016 -

Intruders at Yahoo Inc. not only stole personal information from more than 1 billion accounts, but accessed the company’s own software to produce “forged cookies” that allowed them to get into user accounts without a password.

Cookies are small strings of code that automatically save to website visitors’ phones and computers, often allowing them to skip the sign-in page so they don’t have to re-enter their credentials each time they go to the site. Cookies also underpin the online advertising industry by making it easier...