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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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[–] grte 5 points 2 years ago

https://lemmy.world/post/1290412?scrollToComments=true

The affected instances are coming back and the vulnerability being mitigated. Apparently no personal data was compromised. So you should be fine.