2014 — Gmail: 5 million Gmail account passwords leaked to a…
Technical writeup
5 million Gmail account passwords leaked to a forum, alongside passwords from other email providers. Close inspection revealed the user details to be old (3+ years). Multiple individual targeted hacks of third party websites where people used their Gmail IDs, rather than one big dataleak, suspected to be the method. Gmail itself was not hacked.
Root cause
Hacked