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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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[–] UncleBadTouch 2 points 2 years ago (2 children)

can you temporally take away the ability for mods to put html or any kinda script into the sidebar, at least for now?

[–] TruckBC 3 points 2 years ago

No. Unfortunately. This is not a confirmed vector of attack at this point but we are monitoring.

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

That would essentially be patching the vulnerability. A temporary fix would be just preventing the sidebar from being editable.

(Ideally the vulnerability would be patched, but these things take time.)

[–] TruckBC 5 points 2 years ago (1 children)

At this point it doesn't seem like community sidebars have the voulnerabilty. We are fairly confident that they have identified the voulnerabilty and that lemmy.ca is safe as long as our admin accounts are properly locked down which we have confirmed.

[–] [email protected] 1 points 2 years ago

Oh, good! That's excellent then.