So last night a XSS scripting attack was found on all Lemmy instances. See the lemmy world update here https://feddit.uk/post/453040
What this means is that hackers could inject their own "script" when any user viewed a comment/post that the hackers made. The hackers would then grab your JWT token with the script so they could impersonate that user. (And perform any actions on behalf of the user)
Luckily, it looks like I haven't been compromised so the site config should all be the same
What has been done about this
I've removed any comments or posts which included the script see here https://github.com/LemmyNet/lemmy-ui/issues/1895
I would have removed all custom emojis as well but there was none in our DB, this may potentially mean that this site was not affected. Just in case, I've also rotated the JWT tokens so all tokens are now invalid. This means you will have to logout and log back into the instance
Shoutout to @[email protected] for messaging me about this and bringing it to my attention
Thanks for the tip. I just tried that, didn't work. So I then I deleted all data and that did! It meant I had to login to all my accounts again but it seems to be working.