CIEM vs IAM vs PAM: why cloud entitlements need a separate layer

At a glance

What this is: This is a cloud identity governance explainer showing that IAM, PAM, and CIEM solve different problems, with CIEM closing the entitlement visibility gap left by the other two.

Why it matters: IAM and PAM do not tell cloud teams where effective permissions have drifted, so practitioners need CIEM to expose excessive access across human and non-human identities before it expands blast radius.

Context

Cloud identity programmes often treat access as one problem, but cloud environments split that problem into authentication, privileged control, and entitlement governance. IAM answers who can log in, PAM controls elevated sessions, and CIEM measures the permissions identities actually accumulate across cloud platforms.

The practical gap is effective access. In multi-cloud estates, roles, trust relationships, and machine identities can create access that no single directory or vault makes visible. That means a team can have working IAM and PAM controls while still carrying over-permissioned identities that enlarge the attack surface.

For cloud-first organisations, this is not a naming debate. It is a governance boundary problem, and the article frames CIEM as the layer that IAM and PAM were never designed to provide.

Key questions

Q: What breaks when IAM and PAM are the only identity controls in cloud environments?

A: Cloud teams lose visibility into effective permissions. IAM can authenticate identities and PAM can govern privileged sessions, but neither reliably shows whether a role, service account, or workload identity has accumulated access that was never intended or reviewed. That is where CIEM becomes necessary, because the risk lives in the entitlement graph, not just in login or vault controls.

Q: Why do excessive cloud entitlements increase blast radius?

A: Excessive entitlements let an identity reach more systems, data, and admin functions than its job requires. In cloud environments, those permissions are often spread across roles, trusts, and machine identities, so a single compromise can open paths that IAM and PAM alone never exposed. The wider the effective permission set, the larger the blast radius after misuse or compromise.

Q: How do security teams know if CIEM is actually reducing ransomware risk?

A: Look for fewer unused entitlements, lower privilege concentration in service accounts, and faster revocation of excessive cloud access. If CIEM is working, the average compromised identity should have less lateral reach and fewer paths to critical data or encryption targets.

Q: How should organisations divide responsibility between IAM, PAM, and CIEM?

A: Use IAM to establish identities and base access, PAM to control privileged human use, and CIEM to continuously right-size cloud entitlements. That division prevents teams from overloading one tool with three different jobs. The governance win comes from layering them, not from expecting any one of them to explain the full cloud access picture.

Technical breakdown

Why effective permissions diverge from assigned permissions

Assigned permissions are what a policy says an identity can do. Effective permissions are what the identity can actually do after inherited roles, group membership, trust relationships, and cross-account assumptions are resolved. Cloud providers make that divergence normal because permissions are assembled across multiple control planes, not stored in one directory. That is why a role can look modest in IAM yet still reach sensitive resources once its attached policies and assumptions are combined. CIEM exists to compute that effective picture, which is the only one an attacker or auditor really cares about.

Practical implication: Measure effective permissions, not just assigned roles, when deciding whether cloud access is truly least privilege.

Why PAM stops at the credential boundary

PAM is built to protect privileged sessions and the credentials behind them. It vaults, rotates, brokers, and records access for high-risk human administrators, which is useful where passwords or session elevation exist. But many cloud roles and service accounts do not flow through a vault at all, and their privilege is expressed in policy rather than in a secret that can be checked out. That means PAM can contain a powerful account without exposing whether the account is over-entitled in the first place.

Practical implication: Use PAM to control privileged use, but pair it with entitlement analysis to find privilege that never appears as a session.

How cloud entitlement sprawl changes the identity model

Cloud identity is not just about people. Service accounts, CI/CD roles, functions, and workload identities often outnumber human users and carry broad access because they were designed to work, not to be tightly reviewed. In that environment, entitlement sprawl becomes the real risk variable, because an identity can quietly gain cross-account or cross-resource access that nobody intended. CIEM treats those identities as first-class subjects and shows which ones can move farther than their everyday function requires.

Practical implication: Inventory non-human identities alongside human accounts and review their effective cloud access as a separate governance stream.

Breaches seen in the wild

• Azure Key Vault Contributor escalation 2024: Datadog found Azure Key Vault Contributor could add itself to access policies and read every secret, key and certificate in a vault.
• 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

CIEM is the missing governance layer for cloud entitlements, not another access control brand. IAM still authenticates identities and PAM still protects privileged use, but neither was built to continuously compute effective cloud permissions. That leaves a structural gap in multi-cloud environments where access is assembled from roles, trust paths, and machine identities. Practitioners should treat entitlement visibility as a distinct control plane, not as an add-on to login or privilege workflows.

Cloud identity risk is now driven as much by entitlement drift as by credential compromise. The article’s core point is that an identity can be perfectly legitimate and still carry reach it never should have had. That matters because attackers do not need to break authentication if the effective permission model is already too broad. The implication for governance is that access scope, not just access ownership, has become the measure that determines exposure.

Machine identities make the CIEM problem fundamentally different from traditional IAM. Cloud service accounts and workload roles do not map cleanly to human lifecycle assumptions, and they often operate outside the PAM path altogether. This is why cloud programmes that stop at directory governance miss the identities most likely to accumulate excess access. The practitioner takeaway is to govern the cloud entitlement graph as a first-class asset.

Identity blast radius is the right concept for comparing IAM, PAM, and CIEM. IAM establishes identity, PAM constrains privileged use, and CIEM shows how far an identity can reach if its permissions are combined across the cloud. That makes blast radius the practical metric that unifies the three categories. Teams that cannot see effective permission breadth cannot claim they understand cloud identity risk.

From our research library:

• 97% of NHIs carry excessive privileges, increasing unauthorised access and broadening the attack surface, according to the Ultimate Guide to NHIs.
• Read next: Cloud PAM and CIEM Guide

What this signals

Identity blast radius: cloud teams should think about access in terms of how far an identity can move, not only whether it can authenticate. CIEM is the layer that exposes that distance across roles, trust paths, and non-human identities, which is why entitlement review has become a continuous governance function rather than a periodic audit exercise.

IAM and PAM remain necessary, but they no longer define the whole identity perimeter in cloud estates. Once service accounts, workload roles, and cross-account assumptions are involved, effective permission analysis becomes the control that tells practitioners where excess access really sits, and where a small compromise could spread.

A privileged-access programme without entitlement visibility can still leave broad standing access intact. According to the Ultimate Guide to NHIs 97% of NHIs carry excessive privileges, increasing unauthorised access and broadening the attack surface. That makes CIEM a governance requirement for cloud identity, not a niche optimisation.

For practitioners

• Map effective permissions across cloud accounts Compute what each identity can actually do after roles, inherited policies, and trust relationships resolve. Use that view to separate harmless assignment from privileges that create real exposure.
• Prioritise non-human identities for entitlement review Treat service accounts, workload roles, and CI/CD identities as first-class subjects in access governance because they often hold broad access that human-centric reviews miss.
• Pair PAM with entitlement analysis Use privileged access controls to govern how admins operate, then verify whether the underlying cloud entitlements are broader than the work actually requires.
• Remove unused cloud permissions Strip back actions that identities have never exercised, especially where cross-account trust or inherited policy makes the access wider than the assigned role suggests.
• Review attack paths, not just policies Trace which identities can reach sensitive data or admin-level operations through chained permissions, because that is where cloud blast radius becomes operational.

Key takeaways

• CIEM addresses the cloud entitlement layer that IAM and PAM do not cover, especially where effective permissions are broader than assigned roles.
• Cloud identity risk persists even when authentication and privileged-session controls are in place, because attack paths can exist in the entitlement graph.
• Practitioners should govern human and non-human access together, but measure cloud blast radius through effective permissions and privilege scope.

Key terms

• Cloud Infrastructure Entitlement Management: Cloud Infrastructure Entitlement Management focuses on who has access to what in cloud systems, especially excessive or unused permissions. It helps reveal overprivileged identities, but it does not automatically remove them. In practice, it is most useful when tied to policy enforcement and access expiry mechanisms.
• Effective Permissions: Effective permissions are the access an identity can actually use after role inheritance, scope, and policy are applied. In Azure AI environments, they often matter more than the assigned role name because inherited rights can widen access to data, logs, and secret stores.
• Cloud Entitlement Sprawl: Cloud entitlement sprawl is the accumulation of too many permissions, roles, and access paths across cloud services. It creates visibility gaps and makes it harder to see who can do what, which increases the chance of overprivileged access, privilege escalation, and attacker movement through misconfigured environments.
• Attack path: A sequence of identities, permissions, systems, and data stores that an attacker can traverse after obtaining trusted access. In practice, attack paths matter more than single accounts because they show how a low-risk identity can become a route to high-value exposure.

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 IAM programme, it is worth exploring.