this post was submitted on 10 Jul 2023
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When you connect to a site, there are a few steps to validate that you are who you say you are (identification and authentication). Something like inputing you login/password. Since it would be tedious to do that on every requests, the first time you give your login/password to the server (this is the simplified version, this exchange is a bit more complex usually) the server gives you that JWT. For every subsequent requests, your browser automatically send that JWT that is simple to handle but hard to counterfeit, and the server safely knows that you're whoever is written in that JWT.
I assume there will be a post here when more details are known, or that this post itself will be updated. As with any online service, it's up to the service to decide if they want to communicate. (it may also be a legal requirements in some places to tell user when such an event occurs). Since we're talking about obtaining other user's authentication token including an admin, it is safe to assume that whatever an admin can see has leaked. This can range from basic user informations to more private stuff, although I am not familiar with the software behind lemmy. Note that this is a worst-case scenario; an admin impersonator could have access to anything an admin could see, it does not mean they immediately dumped everything. It depends on their motivation.
Protection against this kind of stuff Compromission of the JWT can happen in many ways and I don't know which way was used. But if there's a flaw in the software used (the lemmy's client-side code, for example) there is not much you can do. JWT can leak through many things :
Basically, stay up to date and don't use shady stuff. Easy to say, I know.
This is great thank you!
This answered all of my questions and really helped me understand what happened, thank you so much for having the patience to walk me through it!
It sounds like using apps to access Lemmy is more secure than signing in on your mobile browser (which is what I'm currently doing.)
I tried a couple apps last week but didn't like them, I think I'll revisit that today.
Thanks again!