Certificate authority Let’s Encrypt found a bug in its systems that accidentally disclosed the email addresses of 7,618 of its users.
Let’s Encrypt investigated the incident and took preventive steps to stop something like this from happening again.
Source: https://threatpost.com/lets-encrypt-accidentally-spills-7600-user-emails/118625/
"id": "LET124327522",
"linkid": "lets-encrypt",
"type": "Breach",
"date": "06/2016",
"severity": "80",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"