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Lemmy security vulnerability update (feddit.uk)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]

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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

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[–] [email protected] 3 points 1 year ago

Thanks for keeping us all safe.. :)