2017 — Yahoo: User accounts have been hacked using forged cookies… 2017 32.0M records affected Share on X Technical writeup Mar 2017. User accounts have been hacked using forged cookies to log in without a password over a 2 year period. Root cause Hacked Referenceshttps://www.cnet.com/news/yahoo-says-forged-cookie-attack-accessed-about-32m-accounts/