Grocery store operators across France faced an unprecedented physical threat Oct. 12 when remote attackers compromised supermarket refrigeration systems across several major retail banners, forcing units out of cooling modes and putting tons of temperature-sensitive inventory at risk. That same day in the U.S., Giant Food’s parent company, Ahold Delhaize, suffered a cybersecurity incident that disrupted e-commerce, online ordering and distribution logistics.
Over the course of a single weekend, two separate cyber incidents across the globe exposed a critical vulnerability in the global food supply chain: digital networks have become a direct physical threat to fresh foods at retail.
That physical vulnerability was exposed during an unprecedented overnight cyberattack that hijacked internet-connected refrigeration controllers across hundreds of French supermarkets, including major banners Intermarché, Coopérative U, Carrefour and E.Leclerc.
According to reports from Reuters and the BBC, hackers remotely forced cooling systems into prolonged defrost cycles, driving temperatures inside commercial freezers and display cases up to 122°F (50°C) for over six hours. The thermal surge silenced automated alarms and forced store managers to discard enormous stocks of spoiled fresh and frozen inventory, resulting in tens of millions of euros in product shrink and lost sales.
Meanwhile, in an update released by Ahold Delhaize, the grocery giant confirmed that a malicious cybersecurity incident detected Oct. 12 forced the retailer to proactively take key IT infrastructure offline — including customer-facing websites, mobile apps and e-commerce fulfillment platforms across brands like Giant Food, Albert Heijn and Delhaize. While physical store doors remained open, online ordering, home delivery routes and digital inventory routing ground to a halt across Europe and the U.S. as technical teams worked to isolate the breach.
The financial scope of these distinct incidents highlights the threat: Retail analysts estimate that Dutch-based parent company Ahold Delhaize faced $130 million to $160 million in lost sales when it took down e-commerce systems across its U.S. (Giant, Stop & Shop) and European store banners. Meanwhile, in a separate operational hack in France, reporting from Radio Télévision Suisse (RTS) and Le Monde confirms physical inventory losses reached tens of millions of euros across hundreds of stores — with individual hypermarkets losing up to $215,000 in dumped cold-case stock.
While these two events targeted different sides of the technology stack, together they signal a dangerous evolution for the fresh produce industry. Cyberattacks are no longer confined to back-office headaches like stolen credit cards, locked payroll or temporary website blackouts. Today, hackers are targeting physical, highly perishable inventory, transforming cybersecurity into a mandatory produce-safety and cold-chain risk management discipline.
Physical Threat vs. Digital Outage
When a retail e-commerce platform goes down, customer checkouts stall and orders back up. But when an operational technology (OT) hack hits store cooling systems, the clock starts ticking on biological shelf life.
“A refrigeration system is different because the products inside cannot wait,” says Neetu Uthaman, senior technical product manager and enterprise technology specialist. “An online outage can stop a sale, but a refrigeration attack can destroy inventory that cannot be recovered.”
The breach in France demonstrated how vulnerable modern “smart” stores are when internet-connected equipment lacks strict safeguards.
“What we saw in France shows the next step: attacks reaching physical systems like refrigeration,” says Thomas Plank, CEO and co-founder of Tributech. “The fridges weren’t broken. They did exactly what they were told, and nothing in the system asked whether that instruction made any sense. Blind trust is the vulnerability. A freezer should simply refuse to become an oven, whoever is asking.”
“The oldest rule in industrial safety applies: the last line of defense should be a separate, simple device, wired independently of the network, that trips on high temperature no matter what the main controller says. If a store’s only protection is the same internet-connected controller an attacker can reach, there is no last line.”
The Food Safety and Pathogen Risk
Beyond immediate product loss and financial shrink, compromised cooling infrastructure creates severe food safety and hazard analysis critical control point (HACCP) compliance hazards.
“If someone gains access to refrigeration controls and can manipulate temperatures, defrost cycles or alarms, retailers can lose confidence that perishable products have remained under proper temperature control,” says Katie Harshman, director of TriVista and a former food microbiologist. “Depending on the product, and how long and how far temperatures move out of control, conditions could be created that allow pathogen growth.”
Harshman points out that the transition from paper records to digital monitoring, while efficient, creates a major single point of failure during a cyber incident.
“We now depend on these digital systems for supplier records, traceability, logistics, process controls and fulfillment,” Harshman says. “Companies need backups that can actually be accessed when the primary system or network isn’t available, and they need a manual way to continue monitoring critical food safety controls during that period. A cyberattack shouldn’t take away your ability to demonstrate that you maintained control of your food safety system.”
Harshman says that backup frequency should align with operational risk.
“How frequently those records need to be backed up should depend on the operation and how much information the business can realistically afford to lose,” she says.
Ultimately, grocery operations must bridge the gap between their IT security teams and food safety directors before an incident strikes.
“Food safety should be involved when the company develops its business continuity plans and practices cyber incident scenario planning,” Harshman adds. “The question isn’t simply, ‘How quickly can IT restore the system?’ It’s also, ‘How do we continue controlling product safely while the system is unavailable?’ And maybe more importantly, ‘What manual verification do we have in place that could identify a problem before it becomes a crisis?’”
Last Lines of Defense: Engineering Mechanical Fail-Safes
To prevent hackers from turning cooling equipment into heaters, safety engineers argue that software defenses like firewalls and passwords are not enough. Stores require physical fail-safes.
“A hacked refrigeration controller is more dangerous than an e-commerce outage because it attacks the physical product directly,” says Mat Merten, a licensed professional engineer for SIL Safe specializing in industrial safety systems. “The oldest rule in industrial safety applies: the last line of defense should be a separate, simple device, wired independently of the network, that trips on high temperature no matter what the main controller says. If a store’s only protection is the same internet-connected controller an attacker can reach, there is no last line.”
Air-Gapping and Shadow OT Visibility
A major contributor to retail vulnerability is network connectivity. When store office Wi-Fi or employee workstations share network space with industrial controllers, a single phishing email can open the door to cold case manipulation.
“Retailers should separate their IT and operational technology networks, limit access to refrigeration controllers and monitor unusual changes to equipment settings,” Uthaman says.
However, maintaining control across dozens or hundreds of store locations is complicated by Shadow OT — programmable logic controllers (PLCs) installed over many years by third-party HVAC contractors outside the scope of corporate IT oversight.
“The fridges weren’t broken. They did exactly what they were told, and nothing in the system asked whether that instruction made any sense,” Plank says.
Retrofitting Zero-Trust at the Store Level
Adding zero-trust security does not require replacing existing store refrigeration controllers, says Patrick Lamplmair, chief technology officer and co-founder of Tributech. Instead, it can be added as software installed at the IT/OT boundary — the junction where store IT networks meet physical refrigeration systems. Every command sent to the equipment passes through this software layer first.
While traditional zero-trust network access (ZTNA) or virtual private networks (VPNs) verify who is connecting to the network, they do not check what a command actually does once access is granted; a valid login can still push a cooler to an unsafe temperature. Lamplmair says command-level zero-trust changes this by validating every instruction before it reaches physical equipment based on three criteria:
- Identity — Commands must be digitally signed by an authorized person or system.
- Granular permission — Access rules can restrict a technician down to a single setting on a specific cooling unit.
- Physical logic — Requests that defy operational common sense, such as raising a produce case from 34°F to 60°F or disabling safety alarms, are automatically rejected regardless of who sends them.
“Most grocers can’t say how many service providers can remotely change their cooler settings. That is the first question they need to answer,” Lamplmair says.
While global equipment manufacturers, such as Danfoss or Dixell, are increasingly subject to secure-by-design regulations, such as Europe’s Cyber Resilience Act, Lamplmair says the primary burden of security enforcement falls on the retailer.
- Software boundary control — Retailers define which external technician or vendor system can modify specific settings, at which store and within what temperature limits.
- Immutable audit trails — Original equipment manufacturer (OEM) service teams perform remote maintenance through this boundary software rather than having continuous network access, generating an unalterable log of every parameter change.
- Contractual safeguards — Grocers should write zero-trust requirements directly into their procurement and third-party service contracts.
“If your service provider’s account was stolen tonight, what could an attacker change in your stores? The answer should be ‘only what that provider is allowed to change, and only within safe limits.’ Every service provider with remote access to a store should be treated as a possible entry point for attackers,” Lamplmair says.
Today, most monitoring systems trust whatever value arrives. If a reading says 34°F, the dashboard shows 34°F. An attacker who warms up a cooler can also feed the monitoring system old, normal-looking readings, so nobody notices until the produce is lost.
“The fridges weren’t broken. They did exactly what they were told, and nothing in the system asked whether that instruction made any sense. Blind trust is the vulnerability. A freezer should simply refuse to become an oven, whoever is asking.”
Lamplmair says retailers can close this gap in two steps:
- Sign data at the source — Each reading is signed as close to the equipment as possible, at the controller or a gateway in the store. The signature proves which device produced the value and when. Any later change breaks it and is detected.
- Verify before use — The monitoring system, and any analytics or artificial intelligence (AI) tools built on it, check the signature before accepting a reading. Readings that fail are flagged or rejected immediately.
Signed records also serve as evidence. When a retailer has to show an auditor, insurer or customer that produce stayed within safe temperatures, a signed temperature history carries far more weight than a log file anyone with admin rights could edit.
Retailers should write these into their procurement and service contracts:
- Unique device identity — Every controller and gateway has its own cryptographic identity. No shared or default passwords.
- Signed commands only — Equipment and remote service platforms accept only commands signed by an authorized person or system.
- Signed data at the source — Temperature readings, alarms and configuration changes are signed where they are created, so they can be verified later.
- Safe limits that can’t be overridden remotely — Setpoint ranges and alarms are enforced in the equipment or at the IT/OT boundary, not just in the user interface.
- Fine-grained, time-limited access — Rights per technician, store and setting, granted for a specific maintenance job instead of standing access.
- A change history the vendor can’t alter — Every remote change is recorded, and the retailer can export and check it.
- Security updates for the full service life — A defined support period and a process for reporting and fixing vulnerabilities. In Europe, the Cyber Resilience Act now requires this.
Protecting the Supply Chain: Buyer-Supplier Resilience
When store-level receivers lose access to inventory and shipping systems, produce sitting in trucks at distribution center bays begins to lose shelf life rapidly.
“If a supplier or distributor loses access to its traceability, cold-chain, receiving or shipping systems, the buyer still needs confidence that the supplier can identify the product, demonstrate control and communicate critical information,” Harshman says. “We are likely going to see buyers asking more questions about this during supplier approval and ongoing verification.”
Uthaman suggests establishing low-tech manual protocols long before an emergency occurs.
“One practical approach is to maintain alternative communication channels with suppliers, keep essential inventory and shipment information accessible through secure backup methods and establish procedures for manually receiving goods,” Uthaman says. “Retailers need to prepare for the day their technology stops working, not just focus on preventing that day from happening.”
Actionable Takeaways for Produce Executives
- Network segmentation — Isolate store IT (Wi-Fi, POS, e-commerce) from OT (refrigeration, HVAC, lighting).
- Hardwired overrides — Install independent, non-networked thermal cutoffs as a physical last line of defense.
- Out-of-band alarm verification — Deploy battery-backed, cellular temperature sensors that alert store personnel independently of store Wi-Fi.
- HACCP integration — Incorporate cyber incident scenarios into HACCP and food safety continuity plans.
- Pre-planned manual backups — Establish manual receiving and hold/release protocols between produce buyers and suppliers prior to system outages.
