Everyone might want to freeze your Jellyfin versions until this gets sorted. As far as we know, nothing has been hijacked, but safer sit on your local copies for now.
I think its our local copies that might have issues if anything. If there is a threat at all, it would affect releases prior to the cve release not since then. Or yeah, if a possible attacker had gained access they may still have it, but its unlikely that would not have been caught.