Les Mousquetaires, owner of Intermarche, said refrigeration units in about 150 stores were heated to 50 C for six hours overnight, and that affected food was discarded. Carrefour said 80 supermarkets were hit; Monoprix said about 5% of its French stores were affected. The Paris prosecutor's office said the attack was affecting connected refrigerators and had led to food losses and fires. France's ANSSI was instructed to investigate.
The systems are typically managed by control panels that can be accessed over the internet for remote maintenance. Danfoss said affected units were running outdated firmware and noted that it had advised customers to update supported systems and migrate legacy ones. Reuters cited earlier research on vulnerabilities in Danfoss AK-SM 800A controllers and fixes addressing authentication bypass and code execution. The reporting does not establish that those specific vulnerabilities were used in this incident; the investigation remains ongoing. https://www.reuters.com/business/retail-consumer/french-supermarket-chain-intermarche-hit-by-cyberattack-150-stories-targeted-2026-10-12