Managing Third Party Risk in 2026: Using ISO 27001 and ISO 42001 for Supply Chain Assurance
- Feb 19
- 4 min read
Updated: Feb 24
It’s February 2026. The traditional definition of a corporate perimeter has collapsed. In a hyper connected ecosystem driven by SaaS and integrated AI solutions, your organisation’s greatest vulnerabilities likely lie outside your own walls.
Third Party Risk Management (TPRM) is no longer just about checking if a vendor uses strong passwords. It’s now about algorithmic inheritance, i.e. if your vendor's AI model drifts, your business bears the liability. This post explores why the static vendor questionnaire is dead and how forward thinking leaders are using the combined power of ISO 27001 (Information Security) and the rapidly adopted ISO 42001 (AI Governance) to secure their supply chains.
The 2026 Reality: You’re Only as Secure as Your Weakest AI Vendor
If 2025 was the year of AI adoption, 2026 is the year of AI accountability.
Organisations today rely on hundreds, sometimes thousands, of third party suppliers. A significant percentage of these vendors are either pure play AI companies or are aggressively embedding generative AI into their existing services (like a CRM or HR platform for instance).
This introduces a new, invisible layer of supply chain risk. A data breach at a vendor (covered by ISO 27001) is still a massive threat. But now, we face new risks:
What if your vendor's chatbot hallucinates and gives your customers bad financial advice?
What if the HR recruitment tool you subscribe to has baked in algorithmic bias?
What if a critical SaaS provider cannot explain how their black box AI made a decision that impacted your business?
In 2026, these aren't theoretical problems; they’re operational and regulatory landmines.
Why Spreadsheets Are Dead: The Failure of Traditional Vendor Due Diligence
For decades, TPRM relied on sending vendors a 300 question Excel spreadsheet once a year. In the age of dynamic AI, this approach belongs in the past.
So, a static questionnaire captures a moment in time. It cannot capture Model Drift (when an AI's performance degrades over time) or changes in training data governance. Furthermore, vendors suffer from questionnaire fatigue, leading to copy and pasted generic answers that provide zero real assurance for your firm.
If you’re still relying solely on spreadsheets to vet a vendor providing high risk AI services, your due diligence process is dangerously obsolete and needs urgent attention.
The Dual Standard Defense: Using ISO 27001 and ISO 42001 Together
Procurement and Compliance leaders need a scalable and verifiable way to establish trust. In 2026, the market is coalescing around a dual standard approach to supply chain assurance.
Because ISO 27001 and ISO 42001 share the same High-Level Structure (Annex SL), they’re designed to integrate seamlessly, providing a comprehensive view of vendor risk.
1. ISO 27001: The Foundation of Data Security (The Container)
ISO 27001 remains the global gold standard for an Information Security Management System (ISMS). When a vendor presents an ISO 27001 certificate, it tells you that they have the rigorous controls to protect the confidentiality, integrity and availability of the data you share with them.
The TPRM Role: It assures you that the transport mechanisms and storage are secure against hacks, breaches and insider threats.
2. ISO 42001: The New Standard for AI Trust (The Contents)
This really is the game changer for 2026. ISO 42001, the standard for AI Management Systems (AIMS), addresses the unique risks that ISO 27001 misses. When a vendor is certified to ISO 42001, it provides assurance on:
Algorithmic Transparency: They have processes to explain how their AI makes decisions.
Bias Mitigation: They actively test for and manage fairness in their models.
Continuous Monitoring: They aren't just checking the model once; they’re monitoring for drift and performance issues throughout its lifecycle.
The TPRM Role: It assures you that your ‘engine’ is safe, ethical and accountable.
Strategic Insight: In 2026, demanding ISO 27001 from a SaaS vendor is the baseline. Demanding ISO 42001 from an AI enabled vendor is your competitive advantage in risk management.
The Flow Down Effect: Regulatory Pressure from the EU AI Act and NIS2
The shift toward certification based assurance isn't just best practice, it's actually being forced by regulation.
The EU AI Act: As enforcement ramps up this year for High Risk systems, the Act places responsibility on the "Deployer" (you) as well as the "Provider" (your vendor). If your vendor’s AI is non compliant, you face the reputational and financial blowback. ISO 42001 is becoming the de facto method for vendors to prove they aren't selling you a regulatory liability.
NIS2 Directive: For critical infrastructure sectors (Energy, Finance, Health), NIS2 explicitly mandates rigorous supply chain security. The flow down requirements mean you must ensure your suppliers have adequate security measures and certifications are the clearest way to demonstrate this to regulators.
Actionable Steps for Procurement and Compliance Leaders
So how do you move from spreadsheet chaos to certified assurance?
Tier Your Vendors by AI Risk: Don't treat every vendor the same. Identify the top 20% who handle your sensitive data OR provide AI driven services that impact customers/decisions. These are your High Risk AI vendors.
Update Vendor Contracts: Insert clauses requiring specific certifications. For standard IT vendors, mandate ISO 27001. For AI vendors, set a roadmap requiring ISO 42001 certification within 12–18 months.
Create a Fast Lane for Certified Vendors: Reward transparency. If a vendor provides valid ISO 27001 and ISO 42001 certificates, allow them to bypass the tedious multiple question spreadsheet. This reduces friction and encourages compliance.
Conclusion
In 2026, you cannot and shouldn’t outsource accountability. As your supply chain becomes increasingly intelligent and autonomous, your methods for managing it must evolve. By leveraging the combined strength of ISO 27001 and ISO 42001, businesses can move beyond trust solely and rely on verified, internationally recognised assurance.
Sampson ISO Audit & Consult Ltd
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