Will the UK’s Cyber Security and Resilience Bill help enterprises overcome supply chain risk? Khushboo Kashyap, Director, Governance, Risk and Compliance, Vanta takes a closer look.
2025 was unprecedented for UK cyber-attacks, with household names falling victim and millions of pounds lost.
It was a wake-up call to enterprises that no one is safe. Retailers, transport providers and critical service operators have all faced operational shutdowns and reputational fallout.
For enterprises in particular, the message was unambiguous: Size, brand strength and mature internal controls are not guarantees of immunity.
It is no surprise then, that 70% of enterprises recently admitted that the cyber-risks to their businesses have never been higher.
The UK government has recognised this risk and sought to put in place more robust plans to counter cyber-threats.
This includes the Cyber Security and Resilience Bill which promises to expand regulatory scope, tighten incident reporting timelines and increase accountability for organisations and critical suppliers that underpin essential digital services.
The Bill also places more emphasis on supply chains, which have emerged as a leading risk factor for enterprises today.
The evolving risk to enterprise supply chains
A striking theme of last year’s high-profile breaches was the implication of third-party suppliers.
Hackers – often using tactics such as social engineering and credential abuse – exploited weaknesses in the supply chain.
This comprised third-party vendors, managed service providers or external platforms with legitimate system access and then moved into the enterprise environment.
In these cases, the supplier became the gateway.
The technical vulnerability may have sat outside the enterprise perimeter, but the operational, financial and regulatory consequences landed squarely inside it.
In some cases, such as the LNER breach, hackers gained access to files managed by a third-party supplier, exposing customer contact details and journey-history information.
Harrods similarly confirmed that customer data was exposed following a compromise of a third-party provider, demonstrating how sensitive information can be accessed through vendor-managed environments rather than internal systems.
In the April 2025 M&S breach, Reuters reported that hackers used M&S login credentials linked to staff at a third-party contractor as a means of access, before the attack escalated into ransomware disruption, illustrating how supplier relationships are now a primary attack vector for large UK enterprises.
In each case, the initial vulnerability lay within a supplier’s network or managed system, but the operational, reputational and regulatory consequences were borne by the enterprise at the centre of the ecosystem – underscoring how third-party risk has become a systemic enterprise threat rather than a peripheral compliance issue.
AI adds additional complexity to supply chain management with the likes of shadow supply chains (untracked, unregulated and hidden agents or unauthorised suppliers and subcontractors) and fast-moving subcontracting. While ourresearch finds eight in ten businesses are confident their vendors would inform them of a breach, the majority (57%) of businesses have terminated a vendor relationship due to security concerns in the past 6-12 months.
This contrast shows that vendor relationships are more fragile than business leaders may believe.
When problems come to light, trust disappears fast.
One security failure can cascade across the supply chain, forcing sudden exits and disruption.
Businesses can’t afford to risk that loss in productivity and customer trust.
This makes one thing clear – the supply chain risk to enterprises is urgent.
To secure their vendor ecosystem, IT and security leaders need to get ahead of regulation on both the operational level and for board oversight or they risk scrambling through a game of compliance-catch-up.
But how can they do so without draining IT and security team resources?
Risk mapping: Define your critical suppliers
At an operational level, security leaders should pinpoint their own risk hotspots in terms of threat and disruption level. They should start a discovery project to identify who their “Critical Suppliers” are.
In practice, this means mapping out every third-party with network access or responsibility for hosting sensitive data and then categorising them according to risk and disruption level.
With that visibility, they can develop and test tiered incident response plans aligned with supplier risk levels.
This could include tabletop exercises with executive leadership, technical simulations and coordinated incident drills with critical suppliers.
This approach lets you test escalation paths, reporting timelines and contractual obligations in advance, rather than during a live breach.
Evidence-based reporting
By implementing evidence-led reporting templates, automated control validation and continuous monitoring of supplier security posture, businesses can provide the board with real-time assurance, not point-in-time attestations.
This approach demonstrates that systemic supplier risk is actively managed without diverting disproportionate time away from frontline threat detection and response.
When it comes to the Cyber Security and Resilience Bill itself, new measures outline rigorous reporting, requiring enterprises to send an initial notification of an incident to regulators within 24 hours and a fuller follow-up report within 72 hours.
Supplier contracts: Standardise measurements
Proposed amendments to the bill will shine a light on high-risk supplier relationships.
This will likely drive stricter vendor contractual obligations. Organisations should strengthen their own supplier agreements by implementing measurements such as incident notification SLAs, rights-to-audit and evidence provisions, continuous monitoring and Software Bill of Materials (SBOMs).
Not only will this make reporting more robust, but it will prove the security of any suppliers at the very beginning of the relationship and give assurance to security and IT teams.
Getting board-level buy-in
Security teams can enforce security procedures that align with the upcoming bill mandates by making clear the business-level risk of non-compliance.
They should show that the consequences carry board-level weight – on par with the current financial and reputational risks associated with regulatory fines, such as the bill’s current ‘4% of turnover’ penalty.
Security leaders should then couple that with introducing evidence-led reporting templates, automated control validation and continuous monitoring of supplier security posture.
This will give boards the assurance that systemic supplier risk is actively managed, without diverting excess time from frontline threat detection and response.
Scaling compliance in 2026 and beyond
Supply chain risk is no longer a peripheral compliance issue; it is a core enterprise resilience challenge.
As AI accelerates vendor complexity and threat actors increasingly exploit third-party dependencies, the traditional perimeter has disappeared.
The Cyber Security and Resilience Bill does well to reflect that reality.
By tightening reporting timelines, expanding scope to systemic suppliers and elevating board accountability, it signals that supply chain oversight is now a regulatory expectation, not a discretionary control.
But legislation is only a catalyst.
Enterprises that treat the Bill as a checklist exercise will remain exposed.
Those that move early by mapping critical dependencies, embedding continuous monitoring, tightening contractual obligations and rehearsing response protocol, will be better positioned to withstand disruption.
The strategic imperative is clear: Get ahead of regulation, build operational resilience into the vendor ecosystem now and ensure supply chain security is governed with the same rigour as financial or safety risk.
