Dear Mr. Agema,

I apologize for my rude and dismissive response to your initial contribution to this thread and for any implication it may have carried as to the soundness of your judgement.

it is usually also prudent to contact the manufacture of the hardware or software the has a potential vulnerability first. If you get no response or feel the response is lacking the priority needed you can then start contacting the authorities. 

Here is a good place to start:

https://www.cisa.gov/coordinated-vulnerability-disclosure-process

What is your goal?  To raise awareness? Drop it at at a EDU forum if you want to stay anonymous. Shoot an email to a secops company

I don't think it's ideal, it would be better to speak to security experts first so some kind of mitigation can be created before the hack is made public.

If you are the first to discover a poison, at least look for the antidote before you release it to the wild.

If no mitigation can be found, at that point putting the word out in a security network or even going public is appropriate. It's better to know the threat than be in the dark.

>Is Hackaday an appropriate place

Only if the finding can be sensationalized? It feels to me like the forum for such topics would be conference talks combined with Q&A.

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Evil lies in the hands. Tools are not evil. Evil is very good at finding tools. Most are not aware of this. Think it through.

Go to a ball game, dude.

When you ask a question, you certainly do not have to like an answer. But it would be nice if you could at least show some respect for someone making the effort to give an honest answer. 

This topic seems to be one that you feel strongly about, but your answer was not clear. Try restating it in different words.

Most probably not.  Hackaday is a community of makers, mostly tinkering with a 3D printer and an Arduino board, or so.  The name "hackaday" might be misleading:  https://hackaday.io/page/3649-hack-chat-guidelines

OK, so what sites would be suitable? Anyone?

I have in mind a place that does for hardware hacks what a newsletter put out by an antivirus company does for software hacks.

Well, you can always create it! Of course there's nothing wrong with putting a very potent hack on HaD, we'd love to see it! Anything we can learn from, dangerous or otherwise, is great!