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.

  • @Jozzo
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    51 year ago

    You need to delete all cookies for lemmy.world in your browser, then log in again.

    • Xero
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      1 year ago

      nvm, I used my other email for Lemmy and completely forgot about it :v , I can log back in now

      I think I fucked up, I check the 2FA on the new account but didn’t click on send 2FA code, now I can’t log back in to edit the comment

      edit: I have another tab opened with that account and it’s still fine, I’ve just edited the comment