I've just logged into someone else's account, using my own details?

They're not, Water; this is what MNHQ said on the thread that I linked to, above :

"You no longer need to enter your Mumsnet password when changing your username. We did this so people who sign up to Mumsnet via social (e.g Google or Facebook) can change their usernames. Previously they weren't able to, as they don't have a Mumsnet password (they log in to Mumsnet via their Google or Facebook account instead). Also on the Mumsnet app you dont need to enter your password to change your username and we'd like to keep the experience consistent where possible."

I logged in today under a different name that I sometimes use, and went to change back to this one. It seems like user names are no longer password-protected?

Can you confirm that my privacy has not been compromised?

This is very worrying

BBInGinDrinking, MNHQ rolled out a new bit of tinkering on Tuesday www.mumsnet.com/Talk/site_stuff/3499990-New-settings-menu?msgid=84717647, it looks as though the current problems may well be related to that.

Fortunately when I logged in this morning I am me!!

So it's an error that occurs when logging in?

No such problems, but something has definitely changed on MN. The account settings pages look different. I also noticed that I had to fully log in with my password, when previously it was saved. I wonder if MNHQ have been tinkering with another fresh look for the site, and these problems are related to that?

Wow. This is really very serious.

This might be completely unrelated but during previous security breaches other sites also had a problem, one being Ebay at the same time as one on MN.

I had an e.mail a few days ago to tell me that Houzz had been hacked. It might be a similar thing, and may not be the only site affected.

Having logged out twice and logged back in again twice, I am now showing as myself and not PorkPatrol. I’m a really infrequent poster here, so I’m not really au fait with the messaging functionality, but I’m assuming that I could have accessed PorkPatrol’s private messages and personal settings and data, had I wanted to? Wow, as an adoptive parent, I am phenomenally phobic about sharing my private/personal information online (I have no social networking accounts whatsoever, for this reason), so I would be beyond horrified if anyone had been able to access my personal information because of a MN security lapse. MNHQ, please can you reassure me that my account has not been compromised?

PorkPatrol, I’m so sorry that I was given access to your account in this data breach, but I would like to reassure you that I logged out as soon as I was aware and that I did not attempt to access any private messages or other personal information linked to your account.

This happened to me yesterday, I hadn't logged in for ages and had to change my password. I didn't recognise the user name, this is the main one I use but do name change so it wasn't obvious it wasn't mine, but it wouldn't let me change it.

When I looked on my profile it said I had 2 DC and there was a different name and email address, I honestly thought DD must have changed it if she'd been on my phone when I was logged in. I checked TIO to see what she'd been posting but realised it was stuff she would have no idea about.
I logged out and back in and got my own profile, I looked to see if there was anywhere I could report it, but then went out and forgot about it until now.

shirley

It’s very tempting, Shirley...

Golly, I am NOT the person showing in my username and I have just realised that I have managed to post under the above name on an 11+ thread. I did use my correct log-in details and it was only when I checked to see if my contribution had posted that I realised the error. (Although there’s not a small part of me that’s actually secretly glad to have been able to post on an 11+ thread under a nom-de-plume...)

I do sincerely hope that whoever is posting under my usual user name is giving fabulously-wonderful advice on the Style & Beauty boards as I’m normally too scared to go ther in my own boring persona!

This is interesting. Sadly I’m still me.

Or maybe I should go and cause loads of troll-like trouble and then pretend I’m not....?

For about an hour, I had trouble name-changing yesterday (yes I do post about different parts of my life under different names). pleased to say I am not amiccissima too

remember that’s what happens to me whenever I call up the IT helpdesk person at work

Not sure if relevant but I was logged out about an hour ago, not by my doing.
Possible glitch or data problem here?

Me too, I’m not yearofchange.