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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[–] woelkchen@lemmy.world 2 points 1 year ago

So, do we change passwords

If you don't use a randomly generated password, it's a good idea to change it anyway. Not because of this specific attack but in general. For the longest time the Lemmy software was just a hobby of a very small group of individuals. While the back-end is written in Rust and probably more robust than the PHP code over at Kbin, I don't think a proper security review was ever conducted, so there's a not so small chance there will be some additional growing pains in the somewhat near future.