I have recently started a new job in a role where I deal a lot with confidential data.
I was replying to an email thread about some very confidential information involving a senior manager of staff. I replied to the people in the message (my boss and their boss) by pressing reply all, wrote the message, pressed send.
Immediately after I'd sent it I realised that a completely random person had been cc'd in. I had no idea who this person was, had never emailed them before.
Very confused I phoned my boss's boss (as boss is away and he is more involved in the situation) to say I don't know how this happened but XX is cc'd to this email.
He obviously wasn't happy, we managed to eventually get IT to retrieve the email as luckily the recipient hadn't read it, but he said it could have been a serious data breach and to be more careful etc. He's going to send an email to the team warning them of this risk.
I said I was totally confused as to how this random person could be cc'd in as I'd only pressed reply all to the original recipients. He said maybe my cursor was in the wrong place and it had autofilled.
At the time I accepted that maybe I'd done that, but on retracing my steps I've worked out it is impossible to cc someone you've never emailed before by accident. Autofill only works on previous recipients (on outlook) and still you'd need to do a few purposive clicks to get their name in the cc field. For someone you've not emailed before, you'd have to either put their entire email address in the cc field or go in to the directory and find them.
I'm new in this role and have my review next week. I'm really, really upset that this has happened and am 99% sure it wasn't me!
Do I say anything or keep quiet? I don't want it to look like I am not taking responsibility or shirking out of it. But a) I don't like to get the blame for something I've not done and b) whats to say it won't happen again?