Least privilege security still fails without lifecycle governance

At a glance

What this is: This is an independent analysis of least privilege security and why it is harder to implement than it sounds.

Why it matters: It matters because IAM, NHI, and human access programmes all fail when standing access outlives the work it was granted for.

By the numbers:

• Only 20% have formal processes for offboarding and revoking API keys, and even fewer have procedures for rotating them.
• 97% of NHIs carry excessive privileges, increasing unauthorised access and broadening the attack surface.
• 91.6% of secrets remain valid five days after the targeted organisation is notified, showing a critical gap in remediation procedures.
• 80% of identity breaches involved compromised non-human identities such as service accounts and API keys.

👉 Read Opal Security's guide to implementing least privilege security

Context

Least privilege security is the idea that every identity should have only the access it needs, only for as long as it needs it. The model is simple, but the operational problem is not: modern environments accumulate standing permissions, unmanaged accounts, and access that no longer matches business need.

For IAM teams, the real challenge is not defining least privilege. It is maintaining it across human users, service accounts, and other non-human identities as systems change, teams move, and access paths drift. That is why least privilege is a governance discipline, not a one-time configuration task.

Key questions

Q: How should security teams implement least privilege without disrupting operations?

A: Start with the systems that matter most, especially crown-jewel applications and data stores. Reduce unnecessary accounts, remove unused permissions, and move high-risk access to task-scoped grants with clear expiry. The key is phased rollout, because least privilege becomes sustainable only when teams can measure drift and adjust without breaking core workflows.

Q: Why do standing privileges create such a large security gap?

A: Standing privileges matter because they outlive the original need for access. Once permissions remain in place after the task is over, they become reusable attack paths for lateral movement, misuse, and forensic confusion. The risk is not just what access exists, but how long it remains available without review.

Q: What do organisations get wrong about just-in-time access?

A: The common mistake is treating JIT as a label rather than an operating model. If the grant is too broad, approval is weak, or expiry is unreliable, the access still behaves like standing privilege. JIT only reduces risk when it is narrow, auditable, and consistently revoked after the task completes.

Q: Who should own least privilege governance across human and machine identities?

A: Ownership should sit with the teams that understand both the business purpose and the technical reach of each identity. That includes application owners for service accounts, system owners for integrations, and IAM teams for policy enforcement. Least privilege breaks when no one is accountable for removing access that is no longer needed.

Technical breakdown

Standing privilege turns least privilege into a moving target

Least privilege breaks down when access is granted once and then left in place. Over time, accounts accumulate permissions that no longer match the original task, and those dormant entitlements become usable attack paths. In practice, the control problem is not just initial provisioning but continuous entitlement decay, where unused or excessive access persists because no process reliably revalidates it. That is why organisations often discover the gap only after an incident or audit.

Practical implication: create a repeatable review process for standing access and tie it to account ownership.

Just-in-time access only works when approval and expiry are enforced

JIT access is intended to narrow the window in which privileged permissions exist, but it can fail if grants are too broad, expire too slowly, or are never revoked cleanly. The architecture matters: entitlement elevation should be time-bound, task-scoped, and auditable, with a clear record of who approved the request and why. Without those controls, JIT becomes temporary standing privilege rather than a genuine reduction in exposure.

Practical implication: validate that time-bound access actually expires and that elevation logs are usable during investigations.

Access drift is the signal that least privilege is no longer real

Access drift is the gradual divergence between assigned privileges and actual operational need. It appears when users, service accounts, or integrations keep permissions that were once necessary but are now excessive. In mature programmes, drift is measured, not assumed, using indicators such as unused access, permanent access share, and high-risk entitlements tied to crown-jewel systems. This is where least privilege becomes measurable governance instead of a policy statement.

Practical implication: track access drift metrics by resource tier and prioritise crown-jewel systems first.

Threat narrative

Attacker objective: The objective is to turn excessive entitlement into broader reach, faster movement, and more damaging access to sensitive systems or data.

1. Entry begins when an attacker or internal misuse path reaches an identity with broader access than the task requires, often through an over-permissioned account or a poorly governed integration.
2. Escalation occurs when that standing privilege allows lateral movement, deeper system reach, or changes to sensitive resources that a true least-privilege model would have blocked.
3. Impact follows when the excess access is used to steal data, alter systems, or make incident forensics harder because the compromised identity had more reach than necessary.

Breaches seen in the wild

• Cisco DevHub NHI breach — IntelBroker exploited exposed Cisco credentials, API tokens and keys in DevHub.
• DeepSeek breach — DeepSeek breach exposed 1M+ log lines and sensitive secret keys.

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

NHI Mgmt Group analysis

Least privilege fails when governance is treated as a provisioning event instead of a lifecycle control. The article correctly frames least privilege as continuous reduction, not a one-off hardening exercise. That matters because the access problem in modern enterprises is rarely the first grant. It is the permissions that survive after the work changes, the team changes, or the system changes. Practitioners should treat entitlement decay as the real enemy.

Identity blast radius: the practical failure mode is not just too much access, but too much retained access. The most damaging exposure is often not the account that was over-permissioned on day one. It is the account that stayed over-permissioned for months because no review process was tight enough to catch it. That is why least privilege must be managed as a living boundary around crown-jewel systems, not as an abstract policy statement. Practitioners should measure how much access is still standing after the job is done.

For non-human identities, least privilege is inseparable from rotation, offboarding, and ownership. Service accounts and API keys do not self-correct when business logic changes. If the organisation does not know who owns them, when they expire, or whether they are still needed, the least privilege model collapses into permanent access by default. Practitioners should align least privilege reviews with NHI lifecycle governance, not just human access reviews.

Zero Trust only works if privilege is genuinely ephemeral, not merely conditional. The article's JIT advice points in the right direction, but the deeper issue is whether access disappears quickly enough to matter. A conditional grant that lingers is still standing privilege in operational terms. Practitioners should evaluate whether their Zero Trust programme is reducing exposure windows or simply renaming them.

Least privilege is now a board-relevant control because breach forensics and business continuity both depend on it. Narrower entitlements do not just reduce attack surface, they also shorten the investigative path after an incident. That makes least privilege part of resilience, not only prevention. Practitioners should position it as a control that improves both containment and recovery.

From our research:

• 97% of NHIs carry excessive privileges, increasing unauthorised access and broadening the attack surface, according to Ultimate Guide to NHIs.
• 91.6% of secrets remain valid five days after the targeted organisation is notified, showing a critical gap in remediation procedures.
• Narrower access is easier to govern when paired with Ultimate Guide to NHIs , Why NHI Security Matters Now, which explains why entitlement sprawl is now a structural risk.

What this signals

Identity blast radius: least privilege programmes now need to be measured by how much retained access they remove, not by how many policies were written. The organisations that can prove reduced standing access will be better placed to defend crown-jewel systems and to explain residual risk to audit and executive teams.

A practical next step is to connect access review cycles to the real ownership of accounts, service identities, and API keys. The governance gap is often not policy intent but failure to keep lifecycle controls in sync with how work actually changes.

With 80% of identity breaches involving compromised non-human identities, per the Ultimate Guide to NHIs, least privilege cannot remain a human-only governance conversation. The control model has to cover service accounts, keys, and integrations as first-class identities.

For practitioners

• Inventory and remove unnecessary accounts Start by identifying every account, integration, and service identity that can reach sensitive systems. Eliminate duplicates, stale accounts, and test credentials that no longer have a business owner.
• Convert broad grants into task-scoped access Rewrite standing entitlements so that higher-risk permissions are only available for a specific task, system, or ticketed workflow. Where possible, pair the grant with time-bound access and a clear expiry condition.
• Measure access drift on crown-jewel systems Track permanent versus time-bound access, unused permissions over a 30 day window, and high-risk entitlements attached to the most sensitive platforms. Use those metrics to decide which systems move first.
• Tie offboarding to account and secret owners Require a named owner for every account, token, and API key so that revocation happens when people leave roles, projects end, or integrations are retired. Without ownership, least privilege cannot be maintained.
• Validate that JIT access really expires Test whether elevated permissions are actually removed after use and whether logs preserve enough detail for post-incident review. If grants persist beyond the task, the control is not reducing exposure.

Key takeaways

• Least privilege fails when access is granted once and then left to drift, because retained privilege becomes a standing attack path.
• The evidence points to a scale problem, not a design problem alone.** 97% of NHIs carry excessive privileges, which shows how common overreach remains in real environments.
• Practitioners need lifecycle-linked entitlement governance, task-scoped access, and measurable drift metrics if they want least privilege to survive beyond policy.

Key terms

• Least Privilege: A governance model that gives each identity only the access it needs to do a specific job. In practice, it is not a static permission setting. It is a continuous control over scope, duration, ownership, and review so that access does not outlive the business need.
• Standing Privilege: Access that remains available after the immediate task, approval, or business purpose has ended. For human users and non-human identities alike, standing privilege increases blast radius because the account can be reused without a fresh business justification or a new control decision.
• Access Drift: The gap between the permissions an identity actually needs and the permissions it still has. Drift usually grows over time through role changes, project changes, and forgotten grants, which makes it one of the clearest indicators that least privilege is no longer being maintained.
• Just-in-Time Access: A pattern that grants privileged access only when it is needed and removes it after the task is complete. For strongest results, the grant must be narrow, time-bound, auditable, and tied to a specific owner or workflow so that temporary access does not become standing access in disguise.

Deepen your knowledge

NHI governance, agentic AI identity, and machine identity security are core topics in our NHI Foundation Level course, the industry's only accredited NHI security programme. If you are responsible for identity security strategy or NHI governance in your organisation, it is worth exploring.

This post draws on content published by Opal Security: Least privilege security is important. But how do you actually implement it? Read the original.