Last updated: April 29, 2026
Cloud IAM is deceptively simple at first glance: users, groups, roles, permissions. In practice, it’s the most complex component of cloud security with the largest blast radius. A single over-permissioned role can enable an attacker who compromises one workload to compromise the entire cloud account. Most cloud breaches are, at their root, IAM misconfiguration.
Why IAM complexity grows
Every new cloud service needs its own IAM integration. AWS has 200+ services, each with its own permissions namespace. Azure has thousands of individual role definitions. GCP has similar complexity. IAM grows as services grow, and the customer’s mental model rarely keeps pace.
Additionally:
- Implicit permissions. Action requires permissions X, Y, Z — you grant X and Y, not Z; action fails; developer adds
*permission. Problem solved; exposure increased. - Resource-based policies + identity-based policies + SCPs + permission boundaries: multiple layers of evaluation. Effective permission = union minus denials. Hard to reason about.
- Assume-role chains (AWS): role A assumes role B which can assume role C. Effective power not captured by any single role’s policies.
- Service-linked roles: pre-configured by cloud provider; varying levels of documentation.
- Organizational policies (AWS SCPs, Azure Policy, GCP Org Policies) add guardrails but also confusion.
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