Edmodo

From the well-known education portal Edmodo, a hacker acquired millions of user account details, and the information appears to be for sale on the dark web.

The exposed data includes usernames, email addresses, and hashed passwords.

They investigated the incident and took prevantive steps to prevent such incident in the future.

Source: https://www.vice.com/en/article/ezjbwe/hacker-steals-millions-of-user-account-details-from-education-platform-edmodo

"id": "EDM115527922",
"linkid": "edmodo",
"type": "Data Leak",
"date": "05/2017",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"