Unroll.me scans your complete mail data and has a tremendous security hole

Yesterday, I had a short discussion with Kathleen, my co-founder, about the tool and I pointed out the scale of data mining unroll.me is running and the implications for privacy and data security. As I wanted to know how these unroll mails look like, Kathleen forwarded one to me. And then – boom! I could access _her_ whole unroll.me account by just clicking on the rollup mail she forwarded! No need to log in anywhere, I just could access her subscriptions, doing whatever I wanted to with her data. THIS. IS. A. TREMENDOUS. SECURITY. HOLE!