How should security teams handle hidden risks in Active Directory and Entra ID?

Why This Matters for Security Teams

Hidden risk in active directory and Entra ID is rarely a single broken permission. It is usually the accumulation of inherited access, stale delegation, nested group sprawl, service accounts, and sync relationships that no one owns end to end. That makes it a governance problem as much as a technical one: if the exposure cannot be mapped to an accountable owner, it will persist after the next review cycle.

Security teams often overvalue visibility tools and undervalue remediation discipline. A scan may show thousands of risky paths, but the real question is which ones unlock privilege, cross administrative boundaries, or widen blast radius through directory trust relationships. Current guidance from the NIST Cybersecurity Framework 2.0 favours outcome-driven risk treatment, which fits directory exposure better than simple hygiene reporting. NHIMG research shows how this pattern plays out in the field, including the Top 10 NHI Issues and the directory credential exposure highlighted in Cisco Active Directory credentials breach.

In practice, many security teams encounter directory abuse only after an attacker has already converted inherited trust into lateral movement, rather than through intentional review of access pathways.

How It Works in Practice

The most effective approach is to break hidden directory risk into remediable pathways. Start by inventorying who can administer what, then trace how that power is inherited through group nesting, role assignments, admin units, application consent, and on-premises to cloud synchronisation. In Entra ID, this includes temporary elevation paths, app registrations, and any privilege that can be regained through linked identities or synced accounts. In Active Directory, the same logic applies to delegated control, ACL inheritance, privileged groups, and shadow admin paths.

From there, assign each exposure to an owner and a treatment path. Some issues require immediate removal of privilege, while others need compensating controls such as tighter delegation boundaries, separation of duties, or moving sensitive accounts out of broad administrative containers. The goal is not to eliminate every complex relationship, because complex directories are normal. The goal is to make every privileged path explainable, reviewable, and attributable.

• Prioritise paths that reach tier-0 assets, identity sync infrastructure, or privileged cloud roles.
• Track inherited permissions separately from direct assignments so hidden authority is not missed.
• Review nested groups and administrative delegation on a recurring schedule, not only during incident response.
• Treat sync relationships as privilege bridges, especially where on-premises control can influence cloud identity state.

This maps well to the Ultimate Guide to NHIs — Key Challenges and Risks, because directory exposures often behave like identity supply-chain problems rather than isolated configuration errors. It also aligns with the control discipline implied by OWASP NHI Top 10, where over-privilege and weak lifecycle control are treated as systemic risk. These controls tend to break down in hybrid estates with multiple synchronisation engines and overlapping admin models because ownership becomes split across infrastructure, identity, and application teams.

Common Variations and Edge Cases

Tighter directory control often increases operational overhead, requiring organisations to balance reduced attack surface against admin friction and migration effort. That tradeoff is real: some environments cannot immediately remove inherited delegation or broad admin groups without breaking legacy applications, break-glass procedures, or directory-dependent workflows.

Current guidance suggests treating those cases as exceptions with explicit expiry dates, not permanent waivers. Where best practice is still evolving, especially around hybrid identity governance, the safest approach is to document the exception, constrain its scope, and monitor for use. Entra ID roles, AD ACLs, and sync-bound identities should be reviewed together because a weakness in one layer often reappears in another. The same caution applies to third-party integrations and automation accounts that inherit broad access through operational convenience rather than business need.

Teams should also avoid assuming that a clean access review means a clean directory. Hidden risk can survive under service accounts, dormant privileged groups, and nested role chains that are invisible in standard reports. NHIMG’s Ultimate Guide to NHIs — Why NHI Security Matters Now reinforces the broader point: visibility is only useful when it changes remediation behaviour. In a mature program, the question is not whether hidden paths exist, but whether each one has an owner, a deadline, and a removal plan.

Related resources from NHI Mgmt Group

• How should security teams handle risks from AI browser extensions?
• How should security teams govern Active Directory service accounts?
• How should teams handle stale Active Directory objects before access reviews?
• How should security teams prevent unwanted persistence in Active Directory and Entra ID?