Cloud IAM Done Wrong: The Permission Creep Problem

How creep starts

It always begins reasonably. A deployment fails at 6 p.m., someone grants a broad role "just to unblock it," and the ticket closes. A contractor needs storage access, gets the same role as the last contractor, and inherits ten permissions they'll never use. Broad grants are fast and never page anyone; narrow grants take thought. Over a year, the environment accumulates hundreds of identities where the ceiling of what they can do vastly exceeds the floor of what they actually do.

Why it matters more in the cloud

On-premises, an over-privileged account still has to cross network boundaries to do damage. In the cloud, IAM is the network boundary. One leaked access key with an over-broad role is a full-environment compromise — no malware, no lateral movement, just legitimate API calls. Nearly every major cloud breach of the past five years traces back to a credential whose permissions were wider than its job.

Cutting it back without breaking production

• Measure actual usage. All three platforms record what each identity really used (IAM Access Analyzer, Entra permissions insights, GCP Policy Intelligence). Ninety days of data tells you what's safe to remove.
• Right-size the worst offenders first. Rank identities by unused-permission count. The top 5% typically hold half the excess risk.
• Fix the pipeline, not just the snapshot. Require expiry on elevated grants, template narrow roles for common jobs, and review access quarterly. Otherwise creep returns in six months.

The takeaway

Least privilege isn't a one-time project — it's a process property. If granting narrow access is harder than granting broad access, your environment will always drift toward broad. Make the narrow path the easy path, and the drift reverses on its own.