Short answer: A ransomware incident at supply-chain software provider Blue Yonder disrupted hosted services used by Morrisons and Sainsbury’s in November 2024. The clearest impact was on warehouse, replenishment and fresh-food logistics. There is no public confirmation in the cited reporting that either supermarket’s entire corporate network was encrypted or that customer data was stolen.
What happened in November 2024?
Blue Yonder said its managed-services hosted environment was disrupted by a ransomware incident. The company’s software supports supply-chain processes for retailers and logistics companies. Associated Press and TechCrunch reported the incident and its effects on customers on 26 November 2024.
This was primarily a third-party availability and operations problem: retailers relying on Blue Yonder services could not use normal hosted workflows. That is different from proof that attackers had separately taken over every system owned by Morrisons or Sainsbury’s.
The reporting does not establish the attacker, ransomware family, initial access method, ransom amount, whether Blue Yonder paid, or whether customer data was exfiltrated.
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What Blue Yonder does
Blue Yonder provides enterprise software for planning and moving goods. Its products can coordinate:
- Demand forecasting and inventory planning
- Replenishment and store ordering
- Warehouse-management workflows
- Transport planning and shipment execution
- Inventory visibility and fulfilment
Blue Yonder has described supply-chain deployments involving Sainsbury’s and Morrisons. Its Sainsbury’s announcement explains the use of planning and store-order forecasting tools: Blue Yonder’s Sainsbury’s announcement. A Blue Yonder customer article also describes Morrisons’ demand-planning and replenishment use: Morrisons supply-chain case article.
Which UK retailers were affected?
Morrisons
Associated Press reported that Morrisons’ warehouse-management systems for fresh produce were affected. Morrisons moved to backup processes while the normal service was unavailable. That could slow or complicate the movement of short-life goods to stores, without meaning that every shop had to close.
Fresh food is particularly sensitive to disruption because orders, picking and deliveries must be updated frequently and accurately. A delay can produce gaps, substitutions or waste even when stores remain open.
Source: Associated Press report.
Sainsbury’s
Sainsbury’s confirmed that its operations were affected and later said services had been restored, according to TechCrunch. The available report does not say that Sainsbury’s experienced a complete operational shutdown, nor does it establish that its point-of-sale, payment-card or entire corporate network was compromised.
Source: TechCrunch report dated 26 November 2024.
Customers outside the UK
Blue Yonder customers in the United States and elsewhere, including Starbucks and major grocery retailers, were also reported as affected. Multiple customers depending on one hosted provider make this a shared-vendor concentration-risk incident rather than an isolated supermarket outage.
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How a software outage can affect supermarket shelves
A supermarket’s physical stores may still have electricity, tills and staff while the systems coordinating stock movement are degraded. The normal chain looks like this:
Customer demand → forecast → replenishment order → warehouse pick → transport plan → store delivery → shelf availability
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- Orders may be generated later or require manual entry.
- Warehouse staff may use backup procedures to pick goods.
- Transport teams may work from older schedules or spreadsheets.
- Inventory records may be less timely or precise.
- Fresh and short-life products may be harder to prioritise.
Paper records, spreadsheets, local systems and preconfigured contingency processes can keep essential trading going. They generally require more labour and create greater risk of duplicate orders, data-entry mistakes, delayed replenishment and difficult reconciliation after restoration.
Was this a supply-chain attack?
It is reasonable to call the event a third-party or software-supply-chain incident: the initial disruption was at a technology supplier embedded in multiple retailers’ operations.
That label does not prove that malicious code was distributed through a software update to every customer. The evidence cited here supports ransomware affecting Blue Yonder’s managed hosted environment, but does not establish the attack mechanism or Blue Yonder’s tenant architecture.
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What is—and is not—confirmed?
| Question | What the available reporting establishes |
|---|---|
| Was Blue Yonder hit by ransomware? | Blue Yonder said disruption to its managed-services hosted environment resulted from a ransomware incident. |
| Were Morrisons and Sainsbury’s affected? | Yes. Morrisons reported fresh-produce warehouse-management disruption and backup procedures; Sainsbury’s confirmed operational impact and later restoration. |
| Were their whole corporate networks encrypted? | Not established. The evidence points to disruption of services dependent on Blue Yonder. |
| Was customer data stolen? | No cited source confirms customer-data exfiltration from Morrisons or Sainsbury’s in this incident. |
| Who attacked Blue Yonder? | Not identified in the cited sources. |
| Was a ransom paid? | Not stated in the cited sources. |
| How long did every customer remain offline? | No complete, customer-by-customer duration is publicly established in the cited reporting. |
Why the wording “UK retailers were hacked” can mislead
“Ransomware attack on a supply-chain provider disrupted systems used by Morrisons and Sainsbury’s” is more precise than saying hackers shut down the supermarkets. The reported effects were degraded logistics and replenishment, with contingency processes available. There is no evidence here of universal store closure, nationwide empty shelves or a separate compromise of each retailer’s full IT estate.
Ransomware can affect three different security properties:
- Availability: systems become inaccessible, which is the clearest documented effect here.
- Integrity: records or workflows could be altered; the cited reports do not describe such changes.
- Confidentiality: data could be stolen; the cited reports do not confirm this for Morrisons or Sainsbury’s.
What this means for shoppers and retail workers
For shoppers
- An unavailable supply-chain service does not automatically mean payment-card or loyalty-account data was stolen.
- You may see substitutions, delayed deliveries or temporary gaps in fresh products rather than a complete store shutdown.
- Use official retailer notices for any account-specific advice; do not infer a data breach solely from product availability.
For store and warehouse staff
Contingency operations can preserve trading but may involve manual picking, paper or spreadsheet records, extra reconciliation and slower communication with suppliers and transport partners. The practical burden is often operational rather than visible as a customer-facing “hack.”
What retailers should learn from the outage
Measure dependency concentration
A common platform can simplify integration and provide consistent planning data, but an outage at that provider can affect several large customers simultaneously. Concentration is not automatically negligent; it needs compensating controls.
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Retailers should test whether fallback processes can handle fresh-food replenishment, warehouse picking, delivery scheduling, supplier communications, inventory reconciliation and the re-entry of transactions after recovery. A backup that exists but cannot run those workflows is not a practical recovery plan.
Ask suppliers specific resilience questions
- Which services remain available if the primary hosted environment is isolated?
- Are customer environments logically and cryptographically separated?
- How often are backups created, and are they immutable or offline?
- How quickly can an individual customer environment be restored?
- Can the retailer export current operational data independently?
- What recovery-time and recovery-point objectives are contractually measured?
- What manual operating mode is supported and tested?
- How are suppliers and logistics partners notified during an outage?
- What incident-notification duties and service credits apply?
- Has the provider conducted a customer-involved disaster-recovery exercise?
Do not assume a different hosting model solves everything
Cloud hosting can reduce infrastructure burdens and improve scalability, but resilience still depends on isolation, backups, recovery design, communications and exercises. Moving systems on-premises, or buying more cloud capacity, does not by itself provide those controls.
Do not confuse this event with 2025 UK retail cyber incidents
The Blue Yonder incident occurred in November 2024. It is separate from the cyber incidents involving Marks & Spencer and Co-op in April and May 2025. The Information Commissioner’s Office separately recorded reports from M&S and Co-op in May 2025: ICO statement. M&S’s own cyber update is at M&S cyber update, and Co-op’s incident page is at Co-op cyber incident information. Those later cases should not be added to the Blue Yonder customer list.
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