Hacked refrigerators: stark reminder of the importance of independent temperature monitoring

In the first half of October 2026, several French retail stores and supermarkets fell victim to a cyberattack targeting refrigerators.

According to Reuters, “hackers raised the temperature of refrigerators and freezers ​at hundreds of French supermarkets to as high as 50 degrees Celsius (122 degrees Fahrenheit) overnight, causing fires and spoiling food”.

HW group is not a cybersecurity company, but has produced environmental monitoring devices and sensors for over 20 years. This particular news story struck us as an example of centralised negligence regarding independent environmental monitoring, which helps to mitigate the various risks associated with electronic appliances running 24/7, 365 days a year.

A shop, retail store or supermarket is essentially a large warehouse with a cashier at the end. Trust us when we say that most warehouses are monitored not only for temperature, but also for various parameters that could affect the stored goods, such as humidity, pressure, airflow, dew point and CO₂.

Laboratories have to monitor conditions due to legislation and certification requirements, which could be the same for specific cold or hot storage, food processing plants, factories, etc. At the same time, coolers, refrigerators and freezers all have one thing in common: they have a normal operational temperature range, and anything beyond that range (whether negative or positive) is considered an anomaly.

The answer to the question “To monitor or not?” is quite simple: “What is there to lose?” or “What is the price of malfunction?” Refrigerators don't necessarily need to be hacked to malfunction — they break like any other appliance over time. Sometimes there is a power outage and, without a reserve power source, the timer to loss always starts ticking.

That’s exactly why, at HW group, we have a special sensor designed for use in refrigerators, coolers, and freezers: the 1WR-Temp Flat. This temperature sensor is suitable for both indoor and outdoor use and has a temperature range of -30°C to +60°C.

The main feature of this sensor is its flat cable, which allows installation in refrigerators without the need to drill probe holes. The cable can also be routed under door seals.

This makes it easy to install a temperature sensor inside a freezer with minimal intrusion. In specific cases where one would want to avoid temperature fluctuations caused by hotter outside air mixing with cooler inside air, we recommend putting the sensor probe inside a small bottle of water to reduce sudden temperature changes.

Of course, this particular sensor is just one of the many that the HW group produces. However, when reading about recent events in France, we couldn't help but be reminded of the importance of independent temperature monitoring. It could save a lot of stress, and ultimately funds, if you are properly alerted when something like a freezer turns into a stove.

And HW group solutions are scalable to any size with the help of SensDesk Technology. A company operating dozens or hundreds of freezers in multiple locations can use the Remote Monitoring Ecosystem to address this monitoring scenario with full flexibility.