Who is accountable for controlling Active Directory sprawl and access creep?

Why This Matters for Security Teams

active directory sprawl becomes a security ownership problem the moment privileged groups, service accounts, delegated admins, and application trust paths grow faster than the people who can review them. The issue is not just cleanup. It is about accountability for identity changes that can silently expand blast radius across domains, forests, and downstream applications. Guidance from the NIST SP 800-53 Rev 5 Security and Privacy Controls aligns with the need for named control owners, while NHIMG research shows how unmanaged identity estates become operational risk, especially when visibility is weak. The Ultimate Guide to NHIs notes that only 5.7% of organisations have full visibility into their service accounts, a strong signal that sprawl is usually hidden until it affects a change window, an audit, or an incident.

In practice, central IAM can set standards, but it cannot own every application group, inherited permission, or legacy trust relationship without direct business and technical accountability. That gap is where access creep persists, because no single team has enough context to decide what should be removed, who can approve it, or what risk a given exception creates. In practice, many security teams encounter the problem only after a stale admin path or over-permissioned account has already been used for lateral movement, rather than through intentional governance.

How It Works in Practice

Effective control starts by assigning ownership at the point where access is created and used. Identity teams should define policy, logging, and review cadence, while infrastructure and application owners are responsible for the actual memberships, trusts, and entitlements in their environments. This is the practical division of labor that prevents “shared responsibility” from becoming “no responsibility.” The OWASP Non-Human Identity Top 10 is useful here because the same ownership gaps that affect service accounts often mirror the patterns seen in AD sprawl: excessive privilege, stale credentials, and weak lifecycle control.

In operational terms, teams should map every privileged group, tier-0 and tier-1 administrative relationship, and sensitive delegation path to a named owner. That owner should be accountable for:

• Approving additions and removals to privileged groups
• Reviewing inherited access and trust relationships on a fixed schedule
• Removing stale memberships after role changes or project completion
• Ensuring break-glass and emergency access is time bound and logged
• Escalating exceptions when business owners refuse to retire legacy access

Where AD is tightly coupled to application access, application owners need to validate whether the directory permission still reflects current functionality or a forgotten integration. This is especially important in estates with long-lived admin groups, scripted service paths, or hybrid identity bridges. The Cisco Active Directory credentials breach illustrates why directory access paths must be treated as active attack surface, not administrative clutter. These controls tend to break down when ownership is undocumented in merged, legacy, or hybrid environments because no one can prove who is allowed to remove access.

Common Variations and Edge Cases

Tighter ownership often increases operational overhead, requiring organisations to balance faster provisioning against stronger review discipline. Best practice is evolving, but there is no universal standard for this yet: some enterprises centralise approval for tier-0 assets while distributing day-to-day ownership for application-specific groups, and others use RBAC with delegated review authorities. The important point is that the review authority must match the system that creates the risk.

Edge cases usually appear in environments with multiple forests, vendor-managed AD, M&A inheritance, or emergency access models. In those settings, ownership should be explicit even when technical control is shared. A central IAM team may maintain the policy engine and reporting, but infrastructure teams must own domain controllers and trusts, and application teams must own the access they requested. NHIMG research on the Ultimate Guide to NHIs is relevant because the same governance gap that leaves service accounts untracked also leaves privileged AD paths unowned. The right question is not who can see the sprawl, but who is accountable for removing it before it becomes a standing exception.

Related resources from NHI Mgmt Group

• Who should be accountable for hybrid identity resilience across Active Directory, Entra ID, Okta, and Ping?
• How should security teams reduce Active Directory sprawl in complex enterprise environments?
• How should security teams govern Active Directory service accounts?
• Who is accountable when orphaned Active Directory access is not removed?