How should security teams prevent unwanted persistence in Active Directory and Entra ID?

Why This Matters for Security Teams

Unwanted persistence in active directory and Entra ID is rarely just a “disabled account” problem. Attackers look for the lingering pieces that keep an identity useful: group memberships, app-consent links, delegated permissions, role assignments, and service principals tied to old lifecycle states. The operational risk is that identity retirement is often fragmented, so the object looks inactive while still retaining pathways into the tenant or domain.

This is where identity governance has to move beyond login status. NIST’s Cybersecurity Framework 2.0 frames identity and access as a continuous governance problem, not a one-time admin task. NHIMG research shows how often identity sprawl and weak lifecycle discipline create durable exposure: in Ultimate Guide to NHIs, only 20% of organisations report formal offboarding and revocation processes for API keys, and 80% of identity breaches involved compromised non-human identities such as service accounts and API keys.

In practice, many security teams discover persistence only after an incident review reveals that the account was “disabled” but not actually stripped of its effective access.

How It Works in Practice

Preventing persistence means treating identity removal as a lifecycle event with multiple cleanup actions, not a single switch. For human accounts, that usually means disabling sign-in, then revoking role assignments, removing group memberships, breaking delegated access, and reviewing any application connections or mailbox access tied to the identity. For applications and service accounts, the same logic applies to secrets, certificates, OAuth grants, managed identities, and enterprise app permissions.

The practical question is: what still grants authority after the user leaves or the workload changes state? If the answer is “a lot,” the identity is still persistent even if authentication has been blocked. Security teams should build offboarding and deprovisioning workflows that trigger on HR termination, role change, contractor expiration, application retirement, and service decommissioning. Where possible, use policy-driven automation so revocation is immediate and consistent across AD, Entra ID, privileged access systems, and connected SaaS applications.

For higher-risk identities, current guidance suggests adding just-in-time access, short-lived credentials, and explicit approval for any standing privilege. That matters because persistence often hides in the gap between long-lived permissions and delayed review cycles. The Cisco Active Directory credentials breach illustrates how credential residue can remain operationally useful long after an initial access path should have been removed. NIST’s identity guidance also supports continuous verification and least privilege as ongoing controls, not annual audit outcomes.

• Disable sign-in, then remove effective access paths.
• Revoke group memberships and privileged role assignments.
• Delete or expire app registrations, OAuth grants, and delegated permissions.
• Rotate or retire secrets, certificates, and tokens tied to the identity.
• Validate the cleanup in AD, Entra ID, and downstream SaaS systems.

These controls tend to break down in hybrid environments with shadow admin accounts, app-to-app trust chains, and manual exception handling because the true access graph is broader than the directory record alone.

Common Variations and Edge Cases

Tighter identity removal often increases operational overhead, requiring organisations to balance rapid deprovisioning against the risk of breaking business-critical access. That tradeoff is especially visible when shared service accounts, legacy applications, or external partners still depend on long-lived credentials. There is no universal standard for this yet, so teams should document where automation is safe and where manual approval is still required.

Edge cases matter. In Entra ID, persistence may sit in app role assignments, service principals, or consented permissions that outlive the original user. In Active Directory, nested groups, inherited permissions, and privileged local admin paths can preserve access even after the primary account is disabled. For third-party integrations, the issue may be an OAuth grant that continues to authorize access independently of the user who approved it. NHIMG research shows this is not hypothetical: in Salt Typhoon US telecoms breach, credential misuse and access persistence were central to the intrusion pattern.

Best practice is evolving toward continuous entitlement review, short-lived access, and explicit lifecycle triggers for all identity types. For security teams, the priority is to make sure every identity has a clear end state, not just a disabled login.

Related resources from NHI Mgmt Group

• How should teams govern hybrid Active Directory and Entra ID at the same time?
• How should security teams govern Active Directory service accounts?
• How should security teams reduce NTLM relay risk in Active Directory?
• How should security teams reduce the risk of password guessing attacks in Active Directory?