this post was submitted on 10 Jul 2023
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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] 32 points 1 year ago* (last edited 1 year ago) (2 children)

This has nothing to do with XSS, it is a simple HTML injection vulnerability, and it can only be exploited by instance admins.

Also Lemmy.world appears to have been running a custom frontend so it’s hard to say how widespread the affects of this are.

[–] [email protected] 9 points 1 year ago

You seem to be following the situation closely. Could you please DM me on Matrix?

[–] [email protected] 1 points 1 year ago* (last edited 1 year 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.

[–] [email protected] 3 points 1 year ago (1 children)

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

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