Even if you always remember to turn your oven off before you leave the house, it may not stay that way. That is, if you own an Aga oven, a smart appliance that can be controlled by a smartphone app.

There’s a new cyber-criminal class, waiting in the wings: Culinary threat actors. In certain design-y and class-conscious circles, installing a cast-iron, top-of-the-line AGA oven and range is pretty ...