TL;DR: Recent incidents show that suppliers can become single points of failure, and Anomali argues CTI teams should assess vendor cybersecurity readiness from the start of procurement rather than relying on checkbox compliance. The practical shift is toward evidence-based vendor due diligence, where exposed services, weak authentication, and poor security staffing become decision factors, not afterthoughts.
At a glance
What this is: Anomali argues that vendor due diligence has become a cybersecurity control issue because exposed services, weak authentication, and poor staffing can turn suppliers into single points of failure.
Why it matters: This matters to IAM and security teams because third-party access, authentication posture, and offboarding discipline now shape procurement risk as much as technical control design.
Context
Supplier risk is no longer just a procurement checklist problem. When vendors expose unnecessary services, rely on weak authentication, or lack incident response capacity, the downstream exposure reaches access governance, resilience, and data handling decisions.
The identity angle is real even in a broader supply chain article: third-party access often depends on credentials, federation, and privileged operational pathways. That means vendor selection has become part of IAM, PAM, and NHI governance, not just a commercial review.
The article is focused on a practical question, which is whether security teams can identify risky vendors early enough to influence the buying decision. That starting point is typical for organisations trying to move from compliance checks to evidence-based third-party risk assessment.
Key questions
Q: How should security teams assess vendor risk before procurement decisions are finalised?
A: Start with externally visible control evidence. Review exposed services, authentication strength, security staffing, incident response capability, and prior compromise history before approval. The goal is not to prove a vendor is perfect, but to decide whether its current posture creates an unacceptable access, resilience, or data-handling risk for your environment.
Q: Why do weak supplier controls increase customer cyber risk?
A: Because suppliers often sit on privileged access paths, sensitive data flows, or operational dependencies. If a supplier lacks strong authentication, exposes unnecessary services, or cannot respond quickly to incidents, compromise at the vendor can become compromise for the customer. The risk is structural, not just reputational.
Q: What are the warning signs that a third-party vendor is too risky to trust with sensitive data?
A: Warning signs include poor security policies, weak access controls, no clear incident response plan, unresolved compliance gaps, a history of breaches or complaints, and unclear physical security practices. A vendor that cannot explain how it protects data, tests controls, or updates its posture over time is usually not ready for sensitive business relationships.
Q: Who should own third-party security due diligence in an organisation?
A: Procurement alone should not own it. CTI, IAM, security operations, and leadership all have a role because vendor risk affects access control, resilience, and data protection. If a supplier can become a single point of failure, accountability has to sit across both buying and security decisions.
Technical breakdown
Why exposed services change third-party risk
Exposed ports, legacy protocols, vulnerable services, and internet-facing test environments all expand the attack surface a vendor presents to its customers. In procurement terms, those signals show whether security is being operated as a live control set or as a statement of intent. For identity teams, exposed admin surfaces and weak remote access patterns also suggest how easily vendor credentials could be abused if the supplier is compromised.
Practical implication: Treat exposed infrastructure as a control failure signal, not just a technical finding, when deciding whether to onboard a vendor.
Why authentication maturity matters in supplier assessments
Strong authentication is a control boundary, not a feature checkbox. If a vendor cannot support modern MFA, SSO, or certificate hygiene, then access to that vendor is harder to govern and easier to misuse. For shared environments and service integrations, weak authentication also increases the likelihood that NHI credentials, tokens, or privileged sessions become the easiest path into customer data or connected systems.
Practical implication: Require modern authentication and federation support before granting third-party access to production data or administrative interfaces.
How staffing and response capability affect breach impact
A vendor without a dedicated security function, incident response capacity, or meaningful leadership oversight may not be able to detect, contain, or disclose a compromise quickly. That matters because supplier incidents become customer incidents when access persists longer than it should. In practical terms, a supplier’s internal operating model determines how much blast radius a customer inherits from the relationship.
Practical implication: Use staffing, leadership, and response maturity as part of supplier risk scoring, not as background context.
Threat narrative
Attacker objective: The attacker objective is to compromise a supplier in a way that creates downstream access to customer data, systems, or operational continuity.
- Entry occurs through externally exposed services, legacy protocols, or poorly maintained systems that enlarge the supplier attack surface.
- Credential or access abuse follows when weak authentication or unmanaged third-party access provides a route into connected environments.
- Impact is transferred to customers when the supplier becomes a single point of failure for data, access, or service continuity.
Breaches seen in the wild
- LiteLLM PyPI package breach: LiteLLM PyPI supply chain attack, credentials stolen from users.
- BeyondTrust breach 2024: A stolen BeyondTrust Remote Support API key let a China state-sponsored actor reset accounts and reach US Treasury workstations in 2024.
Read and download The State of NHI & AI Agent Breach Report 2026, covering 200+ breaches impacting Non-Human Identities including AI Agents.
NHI Mgmt Group analysis
Supplier due diligence has become part of security control design, not just vendor selection. If a supplier exposes unnecessary services or runs weak authentication, the customer inherits an access problem before any contract is signed. That is why third-party risk needs to sit inside procurement, IAM, and resilience governance together. Practitioners should treat supplier posture as an extension of the control environment.
Weak supplier security signals are more actionable than assurance statements. Board presence, security staffing, incident response capacity, and historical compromise patterns are observable indicators that matter more than checkbox attestations. In identity terms, these signals tell you whether access governance is supported by operational discipline or only by policy language. Practitioners should prioritise evidence over claims when approving vendor access.
Vendor risk is increasingly a lifecycle problem for NHI governance. Third-party relationships often rely on API keys, federated access, service accounts, and other machine-to-machine pathways that outlive the original review. That creates a governance gap when vendor access is not continuously revalidated. Practitioners should align third-party reviews with NHI lifecycle controls, especially where supplier access is persistent or privileged.
Supply chain security now depends on who can prove they can be trusted under pressure. The practical test is no longer whether a vendor says it is secure, but whether its exposed attack surface, authentication model, and response readiness can withstand scrutiny. That shifts the market toward more evidence-based procurement and tighter accountability for supplier access decisions. Practitioners should rework third-party onboarding around control evidence, not reassurance.
From our research library:
- Breaches involving third parties rose to 48% of all breaches, a 60% increase on the previous year, according to Verizon's 2026 Data Breach Investigations Report.
- Read next: CI/CD Pipeline Identity Security Guide
What this signals
Supplier due diligence is becoming a proxy for access governance. When vendor relationships depend on machine credentials, federation, or privileged integrations, the security review has to ask who can access what, how that access is authenticated, and how fast it can be withdrawn. That is a governance question, not just a technical one.
Third-party exposure should be read as a lifecycle signal. If a supplier still exposes development systems, legacy protocols, or weak authentication, the issue is not a single misconfiguration but a broader operating model problem. NHI Mgmt Group sees this as a reminder that supplier access must be reviewed continuously, especially where service accounts or API-based trust are involved.
92% of organisations expose NHIs to third parties, raising concerns about supply chain security, according to the Ultimate Guide to NHIs. That figure matters here because supplier risk increasingly lands on non-human identities, not only human accounts. Practitioners should assume vendor due diligence and NHI governance will converge in the same control discussion.
For practitioners
- Start vendor reviews before procurement finalisation Bring CTI, IAM, and security operations into vendor selection early enough to assess exposure, authentication, and response maturity before commercial commitment.
- Verify external attack surface and internet exposure Check for unnecessary ports, legacy protocols, vulnerable services, and exposed development or QA systems as part of third-party due diligence.
- Assess authentication and federation controls Require strong MFA, SSO support, and certificate hygiene before allowing a supplier to handle sensitive data or privileged integrations.
- Score staffing and incident response readiness Review whether the vendor has a dedicated CISO, security team, and incident response capability that can limit the blast radius of compromise.
- Tie vendor access to continuous review Revalidate third-party access, especially service accounts and machine-to-machine connections, whenever exposure, ownership, or security posture changes.
Key takeaways
- Supplier risk is now a security control issue because exposed services and weak authentication can turn a vendor into a single point of failure.
- The article’s core evidence points to operational indicators, not assurances, as the best way to judge third-party readiness.
- Security teams should bring procurement, CTI, IAM, and incident response together so supplier access decisions are based on control evidence.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK and OWASP Non-Human Identity Top 10 address the attack and risk surface, while CIS Controls v8 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-5 — Account Management | Third-party access and supplier identity hygiene are central to the vendor risk checks described. |
| Recommendation — Apply CIS-5 to verify how vendor accounts are created, reviewed, and removed across the supplier lifecycle. | ||
| NIST CSF 2.0 | PR.AA-05 — Access Permissions, Entitlements and Authorizations | The article focuses on whether vendor access and entitlements are justified and controlled. |
| Recommendation — Use PR.AA-05 to validate that supplier permissions are granted only for approved business need. | ||
| MITRE ATT&CK | TA0006;TA0008 — Credential Access; Lateral Movement | The attack pattern discussed maps to compromised supplier access being used downstream. |
| Recommendation — Map supplier compromise scenarios to TA0006 and TA0008 to prioritise detection around credential abuse and pivoting. | ||
| OWASP Non-Human Identity Top 10 | NHI-03 — Vulnerable Third-Party NHI | Third-party connections and supplier-controlled machine identities are a direct concern in this article. |
| NHI-04 — Insecure Authentication | Weak supplier authentication is one of the explicit warning signs in the article. | |
| Recommendation — Review supplier-managed machine identities for vulnerable third-party exposure before approving integration access. Require secure authentication controls for vendor access paths that handle production data or administration. | ||
Key terms
- Third Party Risk: Third party risk is the chance that an outside organization, supplier, contractor, or service provider will create harm for your business. It includes security, privacy, operational, legal, and compliance exposure caused by access to data, systems, or processes. In identity terms, it often arises from shared credentials, integrations, and delegated trust.
- Supply Chain Attack Surface: The supply chain attack surface is the collection of systems, identities, and workflows an attacker can target to alter software before it reaches users. In developer environments, it includes laptops, source control credentials, package manager tokens, and build pathways, all of which can be abused to spread malicious code through trusted channels.
- Vendor Due Diligence: Vendor due diligence is the structured review performed before onboarding or renewing a supplier relationship. It examines risk posture, control evidence, regulatory alignment, and business criticality to determine whether the organisation can safely share data or depend on the vendor for an important service.
- Machine Identity: The digital identity of a machine, device, or workload, such as a server, container, or VM, used to authenticate it within a network. Sometimes used interchangeably with NHI, though NHI is the broader category.
Deepen your knowledge
The NHI Foundation Level course, the industry's only accredited NHI security programme, covers NHI governance, machine identity security, and secrets management. It helps practitioners connect supplier access decisions to the controls that govern them.
Published by the NHIMG editorial team on August 2, 2026.
Updated on October 12, 2026.
NHI Mgmt Group, the independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org