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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.
I mean, if it's something that's editable only by admins of the instance, I'm not sure it constitutes a vulnerability, since admins can change the content to whatever they desire by definition.
Wasn’t clear till further people commented that it was something only and admin could do. So I agree.
We have yet to confirm if a vulnerability exists in the sidebars that can be set by community mods.
can you temporally take away the ability for mods to put html or any kinda script into the sidebar, at least for now?
No. Unfortunately. This is not a confirmed vector of attack at this point but we are monitoring.
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.)
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.
Oh, good! That's excellent then.