(URGENT) Lemmy has an XSS vulnerability in the sidebar - sh.itjust.works
sh.itjust.works
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. [https://sh.itjust.works/pictrs/image/707c0f16-3d5c-4888-b865-34228d968ee6.png]

I don't really understand what any of this means, maybe someone can explain it for me, I'm a little nervous to keep browsing on lemmygrad if this can apparently be exploited thru comments and posts or something?

there's disagreement about what's happening several comments down so an explanation would be appreciated

  • Flyberius [comrade/them]
    ·
    1 year ago

    Thanks for the reply, that's super interesting.

    I don't know how routing works in Rust, but I'm assuming that all requests pass through some sort of authentication middleware regardless of their final endpoint, thus logging you out of you have an invalid timestamp.

    I really should just check myself. Thanks for all your time