This says "Hello new site, I was referred here by this previous website." This has some privacy implications - the administrator of a web site can see which website you were on. Usually this is fairly benign, but it can leak sensitive information, as I shall demonstrate.In his logs, the mobile enthusiast discovered several links from marketing automation platform MailChimp. He clicked on them and discovered each one was unique in that it directed him to the exact newsletter sent out. It's then he realized that each link went to a user's specific copy of the newsletter, meaning he could update the user's email or unsubscribe them if he wished.
Given that in recent years more than 4.5 billion credentials and identities have been leaked as a result of several major data breaches, including high-profile data breaches such as Yahoo and Equifax, as well as security researchers finding almost 2 billion compromised passwords on the Dark Net for sale, it is very likely that your email address has already been leaked, or, worse, your previously used passwords. With spam and phishing emails at an all-time high, it is important to be cautious about suspicious emails that contain attachments or hyperlinks, as you could be just one click away from infecting your system with ransomware or unknowingly giving your password to a cybercriminal.Eden responsibly disclosed the issue to MailChimp on 4 December 2017 and received word the next day that the marketing automation platform intended to fix the flaw. MailChimp confirmed in a tweet on 18 January that it had fixed the bug: https://twitter.com/MailChimp/status/954001872897171457 That same day, Eden went live with his publication of the issue.