Did you know that some Home Assistant integrations can pose real security risks? While you think your smart home is secure, cloud integrations may be sending your most private data to remote servers somewhere on the internet. Today I’ll show you what to watch out for.
What exactly is this?
Cloud integrations are Home Assistant integrations that communicate with external servers over the internet. Imagine this: your motion sensor detects movement, but instead of switching your light directly, it first sends that information to a server somewhere in the world — and that server then sends the signal back.
Typical examples are Google Nest, Amazon Alexa, or Ring cameras. These devices require an active internet connection to function.
The opposite are local integrations: everything stays within your home network. Zigbee devices or ESPHome sensors communicate directly with your Home Assistant — no detour over the internet.
Why does this matter for your smart home?
Let’s be honest: cloud integrations are convenient. You can access your devices from anywhere and often benefit from advanced features like voice control. But they also carry risks.
Imagine your Ring camera gets hacked and strangers are watching into your bedroom. Or the manufacturer shuts down their servers and your €500 devices become expensive e-waste — exactly what happened in 2016 with Google’s Revolv Smart Home Hub.
Local integrations, on the other hand, work even without internet, are faster, and your data stays 100% with you. A Zigbee light switch responds within milliseconds — cloud devices often take 100 milliseconds or more. That might sound negligible, but it gets annoying quickly in everyday use.
How does this work in Home Assistant?
How do you recognize cloud integrations in Home Assistant? It’s actually quite simple: look up the integration on the Home Assistant website. There you’ll find what’s called the “IoT Class”. If it says “Cloud Push” or “Cloud Polling”, it’s a cloud integration.
When you install an integration, ask yourself: do I need to sign in with an online account? Does the device need internet to work? If yes, it’s likely a cloud integration.
The most common pitfalls
The first pitfall: blindly trusting cloud integrations. A stark example is Ring cameras: hackers gained access and were able to watch live, speak to residents, and even frighten children. The problem: weak passwords and missing two-factor authentication. Always use strong, unique passwords and enable 2FA wherever possible.
The second pitfall: ignoring vendor lock-in. If Google, Amazon, or other providers change their business strategy, you’re left with worthless hardware. My tip: before every purchase, check whether a local alternative exists. Local devices are often cheaper and more reliable.
The third pitfall: mixing cloud and local devices without network separation. A compromised cloud camera can serve as an entry point into your entire home network. Use a separate guest network for cloud devices, or a firewall to isolate them. There’s more on this topic in another video (add video link in YouTube).
What can you do creatively or practically with this?
My clear recommendation: use cloud integrations only when truly necessary. For voice control with Alexa or Google — fine. But for simple sensors or switches, there’s almost always a local alternative.
If you do use cloud integrations, secure them properly: strong passwords, regular updates, separate network.
My personal favorites: ESPHome for self-built sensors and Zigbee for off-the-shelf devices. Both work completely locally, are affordable, and absolutely reliable.
Next up is “D” is for Dashboard, or take a look at the overview of all A-Z posts.
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― Joachim