Hackers remotely manipulated refrigeration-control systems at hundreds of supermarkets across France, forcing refrigerators and freezers into prolonged defrost cycles and raising temperatures to as high as 50 degrees Celsius (122 degrees Fahrenheit). The attack affected major retailers including Intermarché, Netto, Coopérative U, Carrefour, E.Leclerc and Monoprix, according to statements from the companies and French authorities. Les Mousquetaires, the owner of Intermarché, said about 150 of its stores were affected, with cooling units heated for roughly six hours overnight. Carrefour reported 80 affected supermarkets, while Coopérative U and Monoprix also confirmed disruption at portions of their store networks. Because the food could no longer be guaranteed safe, retailers discarded large quantities of fresh and frozen products, with early estimates suggesting losses could reach millions of euros. The incident also caused small fires in some locations. The Paris prosecutor’s office described it as a large-scale cyberattack and opened an investigation. France’s National Cybersecurity Agency, ANSSI, was tasked with examining the incident and identified a vulnerability in refrigeration-control software supplied by Danish company Danfoss. Danfoss said many affected systems were older models running outdated firmware that no longer received security updates. The attack illustrates the growing physical and financial risks created by insecure internet-connected equipment in critical retail operations, particularly where legacy systems remain exposed to remote access.