tl;dr: A cyberattack is targeting Danfoss-made refrigeration control systems used by major French supermarket chains including Intermarché, Leclerc, and Coopérative U, forcing refrigeration units into continuous defrost cycles at 50°C. The attack is also disrupting deliveries and electronic shelf label pricing systems. Coopérative U's president confirmed the incident Monday morning, calling it "extremely serious" and promising an investigation.