While I was asleep, apparently the site was hacked. Luckily, (big) part of the lemmy.world team is in US, and some early birds in EU also helped mitigate this.

As I am told, this was the issue:

There is an vulnerability which was exploited
Several people had their JWT cookies leaked, including at least one admin
Attackers started changing site settings and posting fake announcements etc

Our mitigations:

We removed the vulnerability
Deleted all comments and private messages that contained the exploit
Rotated JWT secret which invalidated all existing cookies

The vulnerability will be fixed by the Lemmy devs.

Details of the vulnerability are here

Many thanks for all that helped, and sorry for any inconvenience caused!

Update While we believe the admins accounts were what they were after, it could be that other users accounts were compromised. Your cookie could have been 'stolen' and the hacker could have had access to your account, creating posts and comments under your name, and accessing/changing your settings (which shows your e-mail).

For this, you would have had to be using lemmy.world at that time, and load a page that had the vulnerability in it.

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[–] Simodeus@lemmy.world 3 points 1 year ago* (last edited 1 year ago) (1 children)

It seems that I lost all my subs. There were not many but still annoying.

E: Still subbed but can't see those in Voyager.

[–] vampyre@lemmy.world 2 points 1 year ago* (last edited 1 year ago)

I thought I’d lost mine too, and when I checked the community I wasn’t subbed. I could still view my profile, comments and posts though.

I cleared the cache, then tried to post here and it said I was logged out (even though I could see all my activity except subs). I couldn’t see any way to logout, so I edited my profile and re-entered my password then hit save. That seems to have fixed it, now I can post and my subs are back.