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(URGENT) Lemmy has an XSS vulnerability in the sidebar (self.main)

submitted 2 years ago by AlternateRoute to c/main

41 comments fedilink hide all child comments

cross-posted from: https://sh.itjust.works/post/923025

lemmy.world is a victim of an XSS attack right now and the hacker simply injected a JavaScript redirection into the sidebar.

It appears the Lemmy backend does not escape HTML in the main sidebar. Not sure if this is also true for community sidebars.

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[–] [email protected] 1 points 2 years ago* (last edited 2 years ago) (1 children)

Worst case scenario, they can steal your Lemmy session, right?

Which isn't super bad for a service like Lemmy. This isn't a social network, so most contact list scams would be useless.

Edit: just read the targets were admins. That IS bad.

[–] Auli 3 points 2 years ago (1 children)

Lemmy isn't a social network? Seems to be one to me.

[–] [email protected] 3 points 2 years ago

I mean, not in the traditional sense. You don't have your family and friends as Lemmy contacts and share posts with them. It's more anonymous.