I am already in contact with image-charts owner. but here’s his last response:
I just had cloudflare, they don’t want to do anything even if we know now that it’s related with them. They ask us to ask Samsung Smartthings to update their java version so it will work as we’ve both seen on online forums (and indeed, it’s a good security practice to do so, so you might give it a try and contact them).
I’m really sorry that we can’t go further on our side but I agree with them, the easiest thing is that Samsung Smartthings update their java version