IGA and IAM are different controls in the identity stack

At a glance

What this is: This is a comparison of IAM and IGA, showing that IAM enables access while IGA governs whether access should exist and remain appropriate.

Why it matters: It matters because identity teams cannot treat authentication, access approvals, recertification, and lifecycle governance as interchangeable if they want defensible control across human, NHI, and autonomous identity programmes.

By the numbers:

• Only 5.7% of organisations have full visibility into their service accounts.
• 71% of NHIs are not rotated within recommended time frames, increasing the risk of compromise over time.
• 96% of organisations store secrets outside of secrets managers in vulnerable locations including code, config files, and CI/CD tools.
• 80% of identity breaches involved compromised non-human identities such as service accounts and API keys.

👉 Read RSA Security's explanation of the difference between IGA and IAM

Context

Identity governance and access management are often discussed together, but they answer different questions. IAM is about proving identity and enabling secure access. IGA is about deciding whether that access is appropriate, keeping it aligned to role and policy, and documenting the decision.

That distinction matters because modern identity programmes now span people, service accounts, API keys, tokens, certificates, and increasingly AI agents. If teams collapse IAM and IGA into one control layer, they miss the lifecycle and recertification problems that drive privilege creep, audit failure, and weak Zero Trust enforcement.

Key questions

Q: What breaks when IAM is used without IGA oversight?

A: IAM can provision and enforce access correctly while still leaving the enterprise unable to prove that access remains appropriate. Without IGA, organisations lose the evidence layer for certifications, separation of duties, and lifecycle validation. The result is functional access control with weak governance assurance.

Q: Why do lifecycle changes matter so much in identity governance?

A: Because access is rarely static in real organisations. Joiner, mover, and leaver events create repeated opportunities for privilege to become outdated, excessive, or orphaned. When lifecycle handling is weak, certification becomes noisier, remediation slows down, and security teams lose confidence that access state matches business reality.

Q: How should security teams govern non-human identities alongside human accounts?

A: Security teams should govern non-human identities as a separate lifecycle category with their own inventory, ownership, rotation, and offboarding controls. Human IAM processes are useful, but they do not account for machine-to-machine authentication, code-embedded secrets, or always-on service accounts. The key is to map each identity to a business function and enforce expiry, review, and revocation on that basis.

Q: Who is accountable when access is left active after a role change or departure?

A: Accountability should sit with the identity owner, the application owner, and the business approver chain that failed to remove or revalidate access. Governance frameworks such as NIST Cybersecurity Framework 2.0 and internal access review processes assume responsibility is explicit. If it is not, risk persists after the person leaves.

Technical breakdown

IAM controls prove identity and enable access

IAM covers the authentication and access layer. It establishes who or what is trying to enter a system, then uses controls such as MFA, SSO, and passwordless authentication to decide whether access is granted at login time. In practice, IAM is about reliable entry, federated access, and reducing friction while maintaining assurance. It does not, by itself, answer whether the granted access still makes sense after onboarding, role change, or system drift. That is why IAM is foundational but incomplete for governance-heavy environments, especially when identities persist across applications and infrastructure.

Practical implication: treat IAM as the access enablement layer, not the full governance model.

IGA governs entitlement, recertification, and lifecycle

IGA sits above the login step. It governs whether access should be granted, whether it remains appropriate, and whether the organisation can prove that decision later. That includes access requests and approvals, role management, access certification, identity lifecycle management, and audit reporting. For non-human identities, the same logic applies to service accounts, tokens, and workload credentials. For human identities, it underpins joiner-mover-leaver controls and regulatory evidence. The key point is that IGA is about entitlement validity over time, not just initial access issuance.

Practical implication: use IGA to continuously validate access decisions across people, machines, and service identities.

Zero Trust depends on both access proof and access governance

Zero Trust assumes trust is never implicit. IAM helps prove identity at the moment of access, while IGA helps verify that the access remains justified and compliant after it is granted. Without IAM, there is no strong authentication boundary. Without IGA, access can drift into excess privilege with no effective review or evidence trail. That becomes especially visible in non-human identity environments, where accounts are often over-privileged and poorly inventoried. The architecture only works when authentication and entitlement governance operate as complementary controls.

Practical implication: align IAM and IGA to the same Zero Trust policy model, then measure both access proof and entitlement drift.

Threat narrative

Attacker objective: The attacker aims to turn legitimate identity access into broad, durable entitlement that is harder to detect, revoke, or explain.

1. Entry occurs when a user or service identity authenticates successfully through IAM controls such as passwords, MFA, SSO, or federated login.
2. Escalation occurs when IGA is absent or weak, allowing the identity to keep access that no longer matches role, purpose, or approval state.
3. Impact follows when excessive access accumulates, audit evidence is missing, or a compromised identity can move through systems with legitimate entitlements.

Breaches seen in the wild

• Cisco DevHub NHI breach — IntelBroker exploited exposed Cisco credentials, API tokens and keys in DevHub.
• Coupang Signing Key Breach — Unrevoked signing key credentials expose 33.7 million records after employee offboarding failure at Coupang.

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

NHI Mgmt Group analysis

IAM and IGA are not competing categories. They are sequential controls, and confusing them creates false confidence. IAM answers whether an identity can prove itself and enter a system. IGA answers whether the resulting access is appropriate, reviewable, and defensible over time. The governance mistake is assuming that successful authentication equals acceptable entitlement. Practitioners should separate access enablement from access governance in programme design and reporting.

Identity lifecycle is where IAM-only programmes break down first. Joiner-mover-leaver events, role changes, and offboarding create the conditions where access that was valid yesterday becomes excessive today. IAM can still authenticate the identity, but it cannot decide whether the old access should persist. That is the control gap IGA exists to close, especially where service accounts and other NHIs outlive the business reason for their creation. Practitioners need lifecycle evidence, not just login telemetry.

Zero Trust depends on entitlement validity, not just login assurance. A programme can have strong authentication and still fail Zero Trust if access is never revalidated against role, context, and business need. The same is true across human and non-human identities: trust cannot be proven once and assumed forever. The practical lesson is that access reviews, role design, and auditability are not side controls. They are the governance spine of Zero Trust.

Privilege creep is the predictable outcome when IGA is missing or treated as optional. IAM makes it easy to get in, but IGA is what stops access from accumulating past its legitimate purpose. Over time, that gap expands the blast radius of every compromised account, whether human or machine. Organisations should therefore judge identity maturity by how well they can prove current entitlement, not merely by how well they can authenticate users.

For NHI programmes, IAM and IGA must be applied to the same inventory of identities. Service accounts, API keys, tokens, and certificates are still identities, even if they do not log in like humans. If those identities are not covered by governance workflows, access reviews, and offboarding logic, the programme leaves a blind spot that attackers routinely exploit. Practitioners should extend the IAM and IGA boundary to every non-human credential in scope.

From our research:

• 91.6% of secrets remain valid five days after the targeted organisation is notified, showing a critical gap in remediation procedures, according to Ultimate Guide to NHIs.
• From our research: 96% of organisations store secrets outside of secrets managers in vulnerable locations including code, config files, and CI/CD tools, according to Ultimate Guide to NHIs.
• From our research: For lifecycle and revocation depth, see NHI Lifecycle Management Guide, which expands on provisioning, rotation, and offboarding patterns.

What this signals

Entitlement governance is now the difference between identity coverage and identity control. Teams that can authenticate users but cannot prove whether access is still appropriate will keep accumulating hidden risk across human and non-human identities. The practical signal is simple: if access reviews are late, shallow, or disconnected from lifecycle events, IAM is doing its job while IGA is not.

With 5.7% of organisations having full visibility into their service accounts, per the Ultimate Guide to NHIs, the governance problem is not just entitlement drift but inventory blindness. That is why lifecycle ownership, review cadence, and offboarding need to cover every credential that can reach production, not only named users. Teams should treat incomplete identity inventory as a blocking risk to Zero Trust and audit readiness.

For practitioners

• Separate access enablement from entitlement governance Define IAM as the control set for authentication, federation, and session entry, then assign IGA to approvals, recertification, role validity, and audit evidence. This prevents teams from claiming governance coverage simply because login controls exist.
• Map lifecycle events to entitlement reviews Trigger access certification when users or service identities change role, purpose, ownership, or application dependency. Build this around joiner-mover-leaver events so access updates follow business change instead of calendar convenience.
• Extend governance to non-human identities Include service accounts, API keys, tokens, and certificates in the same access review and offboarding model used for human users. If an identity can reach production systems, it needs an owner, a lifecycle, and a revocation path.
• Measure entitlement validity, not just authentication success Track completed access reviews, toxic combinations, excessive privilege counts, and stale entitlements alongside MFA or SSO adoption. Those are the indicators that show whether IGA is actually governing access instead of documenting it after the fact.

Key takeaways

• IAM proves identity and enables access, while IGA decides whether that access is appropriate and should remain in place.
• The main failure mode is not bad login security alone, but privilege creep, missing recertification, and weak lifecycle governance.
• Identity programmes that span humans, service accounts, and other NHIs need both authentication controls and entitlement governance to be defensible.

Key terms

• Non-Human Identity Access Management: The governance discipline for controlling machine identities such as service accounts, API keys, tokens, and certificates. It covers ownership, permissions, rotation, offboarding, and monitoring so autonomous systems do not accumulate unmanaged access over time.
• Identity Governance and Administration (IGA): A framework of policies, processes, and technology to manage and govern digital identities and their access rights. Increasingly extended to cover non-human identities alongside human users.
• Access Certification: Access certification is the periodic review of whether an identity still needs its current entitlements. For NHIs, certification is only reliable when reviewers know the identity's owner, purpose, and expiry, otherwise stale machine access can persist long after the original use case has ended.
• NHI Lifecycle Management: The end-to-end governance of a non-human identity from creation and onboarding through active management, monitoring, credential rotation, and secure decommissioning.

What's in the full article

RSA Security's full article covers the explanatory detail this post intentionally leaves at the framework level:

• Side-by-side capability breakdowns that distinguish authentication, access approval, certification, and auditing in practice
• Concrete examples of when IAM-only deployments create governance gaps in real identity programmes
• Operational scenarios for rolling out IAM and IGA together or adding IGA to an existing stack
• The article's own examples of success metrics for access provisioning, review completion, and audit findings

👉 RSA Security's full article breaks down IAM-only and IAM-plus-IGA scenarios for practitioners

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 building or maturing an identity programme, it is worth exploring.