Something I knew very well about, but didn't dare to ponder it even on this forum. The issue, however, just went public. The German newspaper writes: "Online bookings with Ryanair can be easily manipulated by others. Even people with no special computer skills could manipulate your booking data and even generate the additional costs for you. In order to view or change his flight details, the customer must select one of three "security options". The third one is way too easy to circumvent."
The Tagesspiegel
(in German) raises a question: "What if your enemy wants to hurt you?". It's not so difficult to answer/ guess the Option Three security questions. You know the day and destination of your ex-partner's travel and his/her e-mail address? You can do with his/her booking whatever you want.
Well, true. Ryanair must have decided to allow this workaround due to very common booking system errors "Your session has been locked" etc., when the only remaining possibility for pax to verify if the booking has gone through was by using the Option 3. But now I guess this will have to be disabled. Ouch!