Cyberattack Reportedly Alters Freezer Settings for French Blood Service

A reported cyberattack against refrigeration-services provider Coolworld altered temperature settings on equipment storing blood products for France’s national blood service, the Établissement français du sang (EFS). During the night of November 1–2, freezers normally maintained around −30 °C were reportedly reprogrammed to a 110 °C setpoint. Potentially affected materials included donor samples and frozen plasma intended for transfusion, notably at facilities in Bourgogne-Franche-Comté. The actual temperatures reached by the equipment and blood products have not been disclosed.

An on-call technician detected abnormal warming, and France’s Health Ministry said timely intervention prevented operational consequences. No plasma destruction, compromised transfusions, or patient harm has been confirmed. The attackers and intrusion method remain unknown, and no public evidence establishes a technical connection to earlier refrigeration sabotage at European supermarkets. The incident highlights the need for healthcare organizations to assess third-party refrigeration controls, independently monitor temperatures, and maintain rapid-response procedures for abnormal settings.