Who should be included when reviewing Domain Admin equivalent access?

Why This Matters for Security Teams

Domain Admin equivalent access is not just about membership in a named group. It is about effective control over the directory, trust relationships, replication paths, and the policy surface that defines who else can become privileged. Security teams often miss delegated admins and service accounts because they look operational rather than administrative, yet those identities can be just as consequential as a human Domain Admin. That is why reviews must focus on capability, not job title or group membership, consistent with guidance in the OWASP Non-Human Identity Top 10. This matters especially in Active Directory environments where privilege is often inherited through nested groups, GPO delegation, replication permissions, or LDAP write access. The review population should include every identity that can alter users, groups, OUs, trusts, or directory-wide settings, even when the access is indirect. NHIMG’s Ultimate Guide to NHIs treats these identities as part of the privileged attack surface, not an edge case. In practice, many security teams discover the real admin population only after an incident review exposes a forgotten delegated account or service principal with broad directory control.

How It Works in Practice

A useful review starts with effective permissions, not the default admin groups. The question is whether an identity can materially change the security boundary of the directory. That includes human admins, delegated support staff, automation accounts, backup agents, identity governance connectors, and any service account with write access to privileged objects or policies. A practical review usually checks for:

• Membership in privileged groups such as Domain Admins, Enterprise Admins, or built-in operator groups.
• Delegated rights on OUs, users, groups, GPOs, trusts, and replication-related permissions.
• Accounts with rights to reset passwords, change group membership, modify ACLs, or create privileged principals.
• Service accounts used by directory sync, patching, EDR, backup, or IAM tooling that can alter directory state.

The key is to trace privilege through inheritance and delegation. An identity may not appear in an admin group but still have equivalent power through ACLs or automation scopes. Current guidance suggests pairing access review with telemetry and configuration analysis rather than relying on static group exports alone. This aligns with the attack patterns described in NHIMG’s 52 NHI Breaches Analysis, where compromised or over-permissioned non-human identities repeatedly become the path to broader compromise. For implementation, teams should map each privileged action to the identities that can perform it, then validate whether each identity still needs that reach. Reviews are stronger when they are tied to actual control points in directory infrastructure and to policy sources such as the OWASP Non-Human Identity Top 10 rather than to a generic access list. These controls tend to break down in large AD forests with nested delegation and legacy service accounts because effective privilege is spread across multiple objects and is hard to reconstruct from a single report.

Common Variations and Edge Cases

Tighter review criteria often increases operational overhead, requiring organisations to balance audit depth against directory complexity. That tradeoff is especially visible when teams are deciding whether to include break-glass accounts, vendor-managed admin accounts, cross-domain sync accounts, and tiered admin models. There is no universal standard for this yet, but best practice is evolving toward inclusion of any identity that can change privileged objects, not just those with obvious admin labels. For example, a service account that manages group nesting or GPO links may deserve the same review treatment as a named administrator if it can indirectly grant Domain Admin equivalent power. Likewise, a delegated helpdesk account might be low-risk in normal use but highly privileged if it can reset credentials for protected users or alter OU-linked policy. Edge cases also matter in hybrid environments. Cloud identity sync, PAM bridges, and directory automation can create indirect control paths that are easy to overlook. In those settings, the question is not whether the account is “an admin” by naming convention, but whether it can change the conditions under which privilege is assigned or enforced. NHIMG’s The State of Secrets in AppSec is also relevant here because long-lived credentials for admin-capable service accounts raise the blast radius when reviews miss them. The practical test is simple: if the identity can create, modify, or preserve privileged access, it belongs in the review population.

Related resources from NHI Mgmt Group

• What is the difference between reviewing human access and reviewing NHIs?
• Who is accountable when a disabled account still has admin access?
• How should security teams run access reviews for non-human identities?
• How should security teams govern non-human identities that have persistent access?