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(URGENT) Lemmy has an XSS vulnerability in the sidebar (lemmy.ca)

submitted 1 year ago by [email protected] to c/[email protected]

42 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] 2 points 1 year ago

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.)

[-] [email protected] 5 points 1 year ago

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 1 year ago

Oh, good! That's excellent then.

this post was submitted on 10 Jul 2023

174 points (97.8% liked)

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