this post was submitted on 10 Jul 2023
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(URGENT) Lemmy has an XSS vulnerability in the sidebar (toad.work)
submitted 2 years ago by brad@toad.work to c/tech@lemmy.fmhy.ml
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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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[–] p03locke@lemmy.dbzer0.com 3 points 2 years ago

Pretend that all HTML needs to be escaped and only disable it on a case-by-case basis.