NHI supply chain risk is outpacing traditional IAM controls

At a glance

What this is: This is an analysis of how non-human identities expand supply chain attack exposure through third-party apps, tokens, and service accounts.

Why it matters: It matters because IAM and NHI teams need visibility, consent control, and lifecycle governance for machine access before attacker paths turn into production compromise.

By the numbers:

• According to Astrix research, 1 in every 10 OAuth apps connected to Google Workspace are connected with a highly-privileged, administrative account.
• According to Verizon’s 2023 Data Breach Report, it takes the average business 204 days to identify a breach and a further 73 days to contain it.

👉 Read Astrix Security's analysis of non-human identities in supply chain attacks

Context

Non-human identity governance is the control problem behind modern supply chain exposure. API keys, OAuth tokens, service accounts, and marketplace apps can enter an environment with little review, while their permissions often outlast the business need that created them. That makes NHI visibility and consent management a core IAM issue, not a niche operational concern.

This article focuses on how attackers use those unmanaged pathways to move through vendor ecosystems and into customer environments. The starting position described here is typical for many organisations, especially where TPRM, SaaS administration, and IAM operate as separate processes with limited shared telemetry.

Key questions

Q: How should security teams govern third-party machine identities in SaaS environments?

A: Security teams should treat third-party machine identities as privileged access paths and manage them with the same discipline used for human admins. That means inventorying every app, token, and service account, assigning ownership, reviewing scopes regularly, and revoking access when the business need ends. Without those controls, consent becomes a hidden persistence mechanism.

Q: Why do OAuth apps and service accounts create more risk than their user-facing setup suggests?

A: They create risk because the visible installation is usually less important than the permissions behind it. A single OAuth grant or service account can silently inherit access to mail, source code, tickets, or cloud resources. If those permissions are broad or poorly tracked, an attacker who steals the token gets immediate operational reach.

Q: What is the difference between TPRM and NHI governance?

A: TPRM evaluates the vendor relationship, while NHI governance controls the actual credentials and permissions the integration uses inside your environment. TPRM may tell you who the supplier is and what assurances they provide. NHI governance tells you what the token can do, who owns it, and whether it still needs to exist.

Q: When should organisations revoke third-party access credentials?

A: Organisations should revoke third-party access credentials whenever the business purpose changes, an incident occurs, the vendor scope expands unexpectedly, or the credential has not been explicitly revalidated. Standing access should be the exception, not the default. If the credential is no longer clearly justified, it is already overdue for removal.

Technical breakdown

Why OAuth apps and service accounts create hidden trust paths

OAuth apps and service accounts become trusted intermediaries because they are granted scopes or permissions that can act on behalf of users or workloads. In practice, the risk is not only credential theft. It is the combination of delegated access, weak owner attribution, and poor review cadence. When those identities are tied to admin roles, the blast radius grows quickly because the compromise does not need to defeat primary authentication. It only needs one durable token, consent grant, or integration key that still works.

Practical implication: teams should inventory delegated access paths and treat high-scope machine identities as privileged assets.

Why token management fails across SaaS marketplaces

Token management breaks down when each platform exposes apps, consents, and ownership data differently. One system may support admin approval, another may rely on user-installed apps, and a third may hide vendor context unless it is manually added to a marketplace listing. That fragmentation makes automation difficult and creates blind spots in detection, review, and revocation. The architectural issue is not simply missing tooling. It is the lack of standardised lifecycle data for non-human permissions across platforms.

Practical implication: build a central inventory that normalises app owner, scope, tenant, and revocation status across SaaS environments.

How supply chain compromise turns into lateral access

Supply chain compromise often starts with a third-party app, support account, or vendor token and then moves into higher-value internal systems. Once an attacker obtains a valid machine credential, they can access logs, issue trackers, source repositories, or cloud consoles with less friction than traditional phishing-based attacks. This is why compromise of a low-visibility integration can still produce high-impact access. The core failure mode is trust inheritance, where one external identity silently inherits the permissions of the environment it touches.

Practical implication: map every third-party credential to the systems it can reach and remove any standing access that is not explicitly justified.

Threat narrative

Attacker objective: The attacker aims to convert third-party trust into durable access inside the customer environment without triggering normal user-facing authentication controls.

1. Entry occurs when attackers compromise a third-party vendor, support account, or OAuth-linked application and obtain a valid token or service credential.
2. Escalation follows when that credential carries administrative or high-scope permissions into customer environments such as issue trackers, source code repositories, or cloud management tools.
3. Impact occurs when the attacker uses legitimate machine access to read sensitive data, harvest additional secrets, and expand into production systems.

Breaches seen in the wild

• Dropbox Sign breach — compromised Dropbox Sign service account exposed API keys and OAuth tokens.
• Salesloft OAuth token breach — hackers stole OAuth tokens to access Salesforce data via Salesloft.

Read our 52 NHI Breaches Analysis report for a comprehensive view of breaches impacting Non-Human Identities including AI Agents.

NHI Mgmt Group analysis

NHI supply chain risk is now an identity governance problem, not only a vendor risk problem. Third-party apps and machine credentials can inherit access faster than security teams can review them, which means TPRM alone is structurally too slow. NHI governance has to join procurement, IAM, SaaS administration, and incident response into one control plane. Practitioners should treat delegated machine access as first-class identity risk.

Blind consent is the defining failure mode in SaaS and marketplace ecosystems. The article’s examples show that users can install apps, grant scopes, and expand permissions without meaningful security review. That creates a runtime governance gap because the organisation often learns about the integration only after compromise or through manual log review. Practitioners should prioritise approval, attestation, and revocation workflows that work at the point of consent.

Identity blast radius matters more than whether the initial access came from a vendor or an employee. Once a token or service account is over-privileged, the attacker gains the same practical reach as an insider with elevated access. That is why the category needs least privilege, ownership clarity, and periodic revalidation instead of static questionnaire-based assurance. Practitioners should measure how far each NHI can move, not just whether it exists.

Third-party machine identity is the new shadow AI problem waiting to happen. The same control weakness that lets unmanaged apps slip into SaaS estates will later affect autonomous agents, which also rely on tokens and delegated scopes. Organisations that solve visibility and entitlement review now will be better prepared for agentic workflows later. Practitioners should build control patterns that apply across integrations, workloads, and AI agents.

From our research:

• 88.5% of organisations acknowledge that their non-human IAM practices lag behind or are merely on par with their human identity and access management efforts, according to The 2024 Non-Human Identity Security Report.
• Only 19.6% of security professionals express strong confidence in their organisation's ability to securely manage non-human workload identities, which shows the maturity gap is not just theoretical.
• For a broader control baseline, review Ultimate Guide to NHIs , Static vs Dynamic Secrets for the lifecycle issues that make standing credentials difficult to govern.

What this signals

Runtime governance gap: the article points to a control failure where integrations are approved once but rarely revalidated as their scope expands. That pattern will only become more dangerous as SaaS estates and AI-enabled workflows grow, so practitioners should expect consent review to move from periodic admin task to continuous security control.

With 23.7% of organisations already sharing secrets through insecure methods such as email or messaging applications, the access problem is clearly tied to process, not just technology, according to The 2024 Non-Human Identity Security Report. Teams that solve sharing and ownership now will reduce the chance that a later breach becomes an untracked identity event.

The next programme priority is to connect SaaS administration, incident response, and NHI governance into one operating model. That means mapping every external credential to a named owner, a scoped purpose, and a revocation trigger before the attacker finds the gap first.

For practitioners

• Inventory all third-party machine identities Map OAuth apps, service accounts, API keys, and marketplace integrations to the systems they can reach, the scopes they hold, and the business owner responsible for them.
• Separate approval from user convenience Move consent review for high-scope apps out of ad hoc user workflows and into centrally managed approval paths with clear entitlement thresholds.
• Enforce rotation and revocation checks Verify that exposed tokens, service accounts, and dormant app consents are rotated or revoked immediately after vendor incidents, employee departures, or scope changes.
• Correlate vendor access to blast radius Document which production systems, repositories, and data stores each external identity can reach so incident response can scope exposure quickly.

Key takeaways

• Third-party machine identities can inherit high-value access without the visibility or review standards applied to human users.
• The evidence shows a persistent maturity gap, with NHI practices lagging human IAM and weak confidence in workload identity management.
• Practitioners should shift from questionnaire-based assurance to continuous inventory, consent control, and rapid revocation of external credentials.

Key terms

• Non-Human Identity: A non-human identity is a machine, workload, token, certificate, service account, or autonomous agent that authenticates to systems and receives permissions. In practice, these identities often outnumber human users and create hidden access paths if owners, scopes, and lifecycles are not tracked carefully.
• Delegated Access: Delegated access is permission granted to one identity to act on behalf of another, usually through OAuth consent, app scopes, or service credentials. It can be useful for automation, but it becomes risky when the delegation is broad, undocumented, or left active after the original purpose ends.
• Identity Blast Radius: Identity blast radius is the set of systems, data, and operational functions a credential can reach if it is misused or stolen. For non-human identities, it depends on scopes, role assignments, and downstream trust relationships, which is why overprivilege is so dangerous in integrated environments.
• Third-Party Machine Identity: A third-party machine identity is a non-human credential owned or operated by an external vendor, app developer, or service provider but used inside your environment. These identities are hard to govern because visibility, rotation, and ownership often span multiple teams and administrative domains.

What's in the full article

Astrix Security's full article covers the operational detail this post intentionally leaves for the source:

• Step-by-step examples of how attackers turn third-party credentials into production access across vendor ecosystems.
• Platform-specific walkthroughs showing where Google Workspace, Slack, and Microsoft 365 hide app consent and installation data.
• Practical examples of how incident response teams should trace exposed tokens back to the systems they can reach.
• Operational guidance on coordinating security, IT, developers, and TPRM teams when third-party access is discovered.

👉 Astrix Security's full article covers the attack paths, platform friction, and response gaps in more detail.

Deepen your knowledge

NHI supply chain exposure and delegated access governance are core topics in our NHI Foundation Level course, the industry's only accredited NHI security programme. If you are building controls for SaaS integrations or AI-adjacent access, it is worth exploring.