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Sharing Jellyfin
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this post was submitted on 25 Apr 2025
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See this issue on their github repo: here
Basically from what I understand there's loads of unauthenticated api calls, so someone can very easily exploit that.
If they just supported mTLS in their clients it wouldn't be an issue but oh well :(
The main unauthenticated action is video streaming, but an attacker would need to guess the correct id by chance.
https://github.com/jellyfin/jellyfin/issues/5415#issuecomment-2825240290
It's not chance if the I'd is based on the path to your media. There's but that much variation in the path to a certain movie and its trivial to build a rainbow table to try them out. This way unauthenticated users can not only stream from your server but effectively map your library