Reducing NHI risk without breaking core infrastructure

At a glance

What this is: Apono frames NHI risk reduction as a visibility and quarantine problem, not a simple revocation exercise.

Why it matters: It matters because IAM teams need ways to reduce standing privilege across service accounts, API tokens, and CI/CD identities without disrupting production dependencies.

By the numbers:

• NHIs outnumber human identities by 25x to 50x in modern enterprises.
• 97% of NHIs carry excessive privileges, increasing unauthorised access and broadening the attack surface.
• Internal repositories are 6x more likely to contain secrets than public ones (32.2% vs 5.6%), contradicting the assumption that private repos are safe.

👉 Read Apono's article on reducing NHI risk without breaking infrastructure

Context

Non-human identity risk is the problem of machine accounts, API tokens, service accounts, and pipeline credentials accumulating privilege faster than teams can see or govern them. In modern environments, these identities are created by automation, embedded into workflows, and then left to persist long after the original purpose has changed. The result is not just sprawl, but governance debt that IAM programmes were never designed to absorb cleanly.

The operational tension is straightforward. Security teams need to reduce exposure, but NHIs are often tied directly into infrastructure, deployment, and customer-facing processes. If access is removed blindly, services can fail. If nothing changes, standing privilege and orphaned credentials remain in place. That is the control gap this article is really about: how to reduce NHI risk without turning remediation into an outage.

Apono presents quarantine as a deny-first approach that blocks access without deleting the identity or changing the underlying infrastructure. That framing is typical of mature NHI operations because the hard part is not detection, but making a safe decision about what can be constrained, what must stay alive, and what should be reviewed before anything is revoked.

Key questions

Q: How should security teams reduce NHI risk without breaking production systems?

A: Start by identifying which machine identities are actually embedded in live workflows, then apply the least disruptive control that reduces exposure. Deny-based quarantine is useful when you need immediate containment but cannot yet prove an identity is safe to remove. The key is to tie remediation to dependency evidence, not just privilege level.

Q: Why do NHIs create more operational risk than human accounts during remediation?

A: NHIs are often hard-wired into deployments, integrations, and infrastructure tasks, so removing access can interrupt services rather than simply lock out a user. Their risk comes from both standing privilege and hidden dependency. Teams need ownership, usage, and blast-radius data before they touch production entitlements.

Q: What breaks when organisations revoke NHI access without inventory and ownership data?

A: They risk disabling pipelines, integrations, or service workflows that nobody has documented well enough to restore quickly. Without a reliable inventory, a revocation campaign can create more instability than security value. That is why containment first, removal later is often the safer order for machine identities.

Q: Who should own decisions about quarantining or revoking machine identities?

A: The decision should sit with identity security, infrastructure owners, and application teams together, because none of them alone can see the full dependency chain. NHI governance is shared operational accountability. The safest decisions come from combining access data, business criticality, and rollback planning before action is taken.

Technical breakdown

Why NHI revocation is hard in production environments

Non-human identities are frequently wired into live systems rather than managed as isolated accounts. A service account can authenticate a build pipeline, a token can trigger a deployment, and a machine credential can reach customer data. In that environment, revocation is not a neutral action. It can break dependencies that are not well documented, especially when identities were created ad hoc for speed and never fully inventoried. The governance challenge is therefore architectural: the identity is doing work, not just holding access.

Practical implication: map every NHI to the process it powers before changing permissions.

How deny policies differ from deletion or rotation

A deny policy changes authorization outcomes without changing the identity object itself. That matters because the credential, account, or integration may still need to exist for audit, rollback, or later review. Deletion removes the identity entirely. Rotation replaces the secret but preserves the access pattern. Deny-based quarantine sits between those options and is useful when you need immediate risk reduction but cannot yet prove that the identity is safe to remove. It is a control for containment, not final remediation.

Practical implication: use deny-based quarantine as an interim control when ownership or dependency is still unclear.

Why visibility and usage data determine safe remediation

Discovery and usage telemetry are the deciding inputs for NHI remediation. If you cannot see where an identity exists, who owns it, or whether it is actively used, then the remediation decision becomes guesswork. Mature NHI governance relies on usage context, privilege scope, and business criticality to distinguish dormant zombie identities from active production dependencies. Without that context, teams either leave risk untouched or create unnecessary breakage by overcorrecting.

Practical implication: require usage evidence before any privilege reduction campaign reaches production.

Threat narrative

Attacker objective: The objective is to exploit or retain machine access that can be used to move into deployment, infrastructure, or data environments with little oversight.

1. Entry begins when ad hoc service accounts, API tokens, or CI/CD identities are created faster than inventory and ownership processes can track them, leaving unmanaged access in place.
2. Escalation occurs when those identities are granted elevated permissions for convenience and then left unreviewed, creating standing privilege that attackers or misuse can exploit.
3. Impact follows when dormant or overprivileged machine access becomes a route to deployment systems, infrastructure, or customer-facing services, expanding blast radius and persistence.

Breaches seen in the wild

• Shai Hulud npm malware campaign — Shai Hulud campaign: npm malware exposed secrets on GitHub.
• 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 blast-radius control is now the real governance problem. This article is not really about quarantine as a feature. It is about the fact that many organisations can identify risky machine access but cannot change it safely because the identity is already embedded in production flows. That makes privilege scope, ownership, and dependency mapping the decisive variables. Practitioners should treat blast-radius reduction as the governing objective, not just credential cleanup.

Standing privilege without service dependency clarity is a control debt, not a hygiene issue. The article shows why NHI governance fails when teams assume every identity can be removed like an unused human account. Machine identities often survive because nobody wants to be the person who breaks a deployment path or customer workflow. The implication is that lifecycle governance for NHIs must be tied to runtime dependency evidence, or else orphaned access will remain the path of least resistance.

Quarantine exposes a familiar assumption failure: revocation must be final to be useful. That assumption was designed for simpler account models where removing access was the primary remediation. It fails when the identity is deeply connected to infrastructure and downtime risk is immediate. The implication is that NHI programmes need containment states, not just on or off decisions, because operational safety is part of governance.

Visibility is still the foundation, but visibility alone does not reduce risk. Discovery tools can tell teams what exists, yet the hard decision is which identities can be constrained without breaking core operations. That is why mature NHI governance has to combine inventory, privilege analysis, and business context. Practitioners should stop treating discovery as the finish line and start treating it as the input to controlled remediation.

Secret sprawl challenge: This article sits inside a broader pattern where machine credentials are created in code, pipelines, and cloud workflows faster than security can govern them. The governance implication is that NHI control is increasingly a runtime discipline rather than a periodic review exercise. Practitioners should align remediation design to the places identities are actually born and used.

From our research:

• 97% of NHIs carry excessive privileges, increasing unauthorised access and broadening the attack surface, according to Ultimate Guide to NHIs.
• Only 20% have formal processes for offboarding and revoking API keys, and even fewer have procedures for rotating them, according to Ultimate Guide to NHIs.
• If you are building containment-first remediation, the Guide to the Secret Sprawl Challenge helps connect secret discovery to safe response decisions.

What this signals

Secret sprawl challenge: NHI programmes are moving from discovery-only maturity to containment-led operations, because the real question is no longer whether a risky identity exists but whether it can be constrained safely. Teams that still rely on periodic access reviews will keep finding identities that are technically visible but operationally untouchable.

The practical signal for IAM leads is that remediation workflows now need a rollback-aware path for machine identities. That means ownership records, dependency mapping, and business criticality must live beside the entitlement data, or every reduction exercise becomes a production-risk discussion instead of an identity-control decision. With 80% of identity breaches involving compromised non-human identities, the programme risk is already operational, not theoretical.

Organisations should expect more use of deny-first controls and less reliance on immediate deletion or blanket revocation. That shift matters because it changes how policy, infrastructure, and application owners collaborate. When machine access is deeply embedded, the governance model has to support temporary containment, evidence gathering, and staged offboarding rather than one-step removal.

For practitioners

• Build an NHI dependency map before revocation Record which service accounts, tokens, and CI/CD identities support deployments, integrations, and customer-facing workflows before changing access.
• Use deny-based quarantine for high-risk identities first Apply temporary deny policies to dormant or suspicious NHIs when you cannot safely prove they are unused or non-critical.
• Require usage evidence before privilege reduction Check recent authentication, workload, and workflow activity so you can distinguish live machine access from stale or orphaned access.
• Separate containment from permanent remediation Treat quarantine as the first step, then review ownership, business logic, and rollback requirements before any permanent revocation or deletion.

Key takeaways

• NHI risk is often harder to reduce than to detect because machine identities are embedded in live production dependencies.
• Excess privilege and incomplete ownership data make revocation risky, which is why deny-based quarantine is a practical intermediate control.
• The governance test is not whether access can be removed, but whether it can be constrained and later retired without breaking services.

Key terms

• Non-Human Identity: A non-human identity is a machine credential used by software, services, workloads, or automation to authenticate and act in a digital environment. In governance terms, it must be inventoried, scoped, monitored, and retired just like a human identity, but with stronger dependency awareness because systems often break when it is removed.
• Deny Policy: A deny policy is an authorization control that blocks a specific identity from accessing a resource without necessarily deleting the identity itself. For NHIs, it is useful when the account or token must remain present for rollback, audit, or later review but should not continue to operate freely.
• Blast Radius: Blast radius is the amount of damage an identity can cause if it is misused or compromised. For NHIs, it is determined by privilege scope, reach across environments, and how deeply the identity is embedded in production workflows, which makes entitlement reduction a containment problem as much as a security one.

Deepen your knowledge

NHI governance, agentic AI identity, and machine identity lifecycle are core topics in our NHI Foundation Level course, the industry's only accredited NHI security programme. If you are responsible for identity security strategy or NHI governance in your organisation, it is worth exploring.

This post draws on content published by Apono: Why Reducing Risk from Non-Human Identities Shouldn’t Break Your Infrastructure. Read the original.