Why do excessive permissions keep showing up in IAM programmes?

Why This Matters for Security Teams

Excessive permissions are rarely the result of one dramatic failure. They accumulate through RBAC reuse, emergency exceptions, inherited group membership, stale service accounts, and incomplete offboarding until least privilege becomes more aspiration than control. For non-human identities, the problem is amplified because access is often provisioned for pipelines, scripts, and integrations that outlive the original business need.

NHI Management Group research shows that 97% of NHIs carry excessive privileges, which is why this issue keeps resurfacing in mature IAM programmes. The pattern is not just operational noise. It expands blast radius, weakens zero trust assumptions, and makes compromise easier to convert into lateral movement. Guidance from the OWASP Non-Human Identity Top 10 aligns with what incident responders see in practice: the access model is usually broader than the workload actually needs.

In practice, many security teams encounter overpermissioned accounts only after a secrets leak, vendor compromise, or cloud audit has already exposed how much access had quietly accumulated.

How It Works in Practice

Fixing excess access requires treating identity sprawl as a lifecycle problem, not a one-time cleanup. The first step is inventory: service accounts, workload identities, API keys, federation trusts, and cloud roles need to be discoverable across SaaS, CI/CD, cloud control planes, and internal platforms. NHI Management Group’s Ultimate Guide to NHIs notes that only 5.7% of organisations have full visibility into their service accounts, which explains why permission creep often survives routine reviews.

From there, access should be reduced using task-based entitlements, short TTLs, and just-in-time elevation instead of standing privilege. For non-human identities, static roles frequently become overbroad because they are designed around convenience and reuse, not per-request necessity. Current best practice is to pair workload identity with policy enforcement at request time, then issue ephemeral credentials only for the action being performed. Standards and implementation guidance such as the SPIFFE project and the CISA Zero Trust Maturity Model are useful anchors for this approach.

• Inventory every NHI and map it to an owner, purpose, and expiry date.
• Replace static shared secrets with workload identity and short-lived tokens where possible.
• Review permissions against actual runtime use, not just role design.
• Revoke unused entitlements automatically when a workload, pipeline, or integration is retired.

These controls tend to break down when environments rely on legacy integrations, shared admin accounts, or manually maintained exception lists because the real access path no longer matches the documented one.

Common Variations and Edge Cases

Tighter permissioning often increases operational overhead, requiring organisations to balance faster delivery against stronger control. That tradeoff is real, especially in platform teams that support many product groups or in hybrid estates where applications were never built for modern identity controls.

There is no universal standard for exactly how granular every non-human permission should be, but current guidance suggests the most reliable pattern is to start with observability, then shrink privilege around verified use. Some workloads need broader read access for discovery, while others need narrowly scoped write access only during deployment windows. The key is to distinguish temporary operational exception from permanent entitlement.

Edge cases also matter. Shared service accounts in legacy systems may need compensating controls such as vaulting, rotation, segmentation, and alerting. Cloud-native workloads may support more aggressive JIT issuance because their tokens can be minted and revoked automatically. The Azure Key Vault privilege escalation exposure is a reminder that even well-intended admin paths can become privilege amplifiers if role boundaries are too broad. The operational goal is not perfect symmetry across every system, but a measurable reduction in standing access and unchecked inheritance.

Related resources from NHI Mgmt Group

• Why do access creep and privilege abuse keep showing up in IAM programmes?
• What does the 144:1 NHI-to-human ratio mean for IAM governance programmes?
• How should teams use cloud asset management data in IAM programmes?
• How should security teams implement separation of privilege in IAM programmes?