Yahoo: A group of hackers accessed the account information of more than a billion users of Yahoo in 2013. It was exposed later that the actual number of impacted users was 3 billion.
LinkedIn: In 2021, LinkedIn saw data of 700 million users posted on a dark web forum. A hacker with the name of “God User” used data scraping techniques by exploiting the site’s API before dumping the data of 500 million users initially and later sharing the rest.
Sina Weibo: Sina Weibo announced that an attacker had obtained databases of around 538 million users, including their real names, gender, location, and more. The attacker was reported to sell the database on the dark web for $250.
Facebook: In 2019, it was revealed that two datasets from Facebook apps had been exposed to the public internet. The information included phone numbers, account names, and Facebook IDs of 530 million users.
MySpace: MySpace hit the headlines in 2016 after 360 million users’ accounts were leaked on LeakedSource.com. They were sold on a dark web market, “The Real Deal” for 6 bitcoins.
Microsoft: In 2021, over 30,000 businesses were affected due to an attack on the Microsoft Exchange email servers. The hackers exploited zero-day vulnerabilities to gain unauthorized access to emails.
NetEase: In 2015, NetEase suffered a breach, when email addresses and plain text passwords of 235 million users were being sold on dark web marketplace.