The gradual expansion of access, delegated permissions, and lifecycle complexity in the layer surrounding a core platform. In SAP BTP-style environments, the core may stay clean while the surrounding integrations, workflows, and service identities accumulate risk that is harder to see and govern.
Expanded Definition
Extension-Layer identity drift describes the slow accumulation of service accounts, API keys, OAuth grants, technical roles, connectors, and delegated workflows around a core platform. In SAP BTP-style environments, the platform itself may remain well governed while the extension layer becomes the real source of privilege creep, orphaned access, and uncertain ownership.
This term is best understood as an operational pattern rather than a formal standard. Definitions vary across vendors, but the risk signal is consistent: the farther identity moves from the core system boundary, the easier it is for permissions to expand without review. That makes extension-layer drift closely related to lifecycle governance, secrets management, and Zero Trust control design as described in the NIST Cybersecurity Framework 2.0.
NHIMG research shows why this matters, especially when identities outnumber human users by a wide margin and visibility remains incomplete across service accounts and secrets. The most common misapplication is treating extension-layer access as a one-time integration task, which occurs when teams approve connectors and credentials during deployment but never revisit them after scope changes.
Examples and Use Cases
Implementing control over extension-layer identity drift rigorously often introduces more review overhead and slower change delivery, requiring organisations to weigh integration speed against access certainty.
- A workflow in SAP BTP receives access to a production API, then later inherits additional scopes for reporting and remediation, creating silent privilege expansion.
- An integration account created for a short-lived project remains active after the project closes, leaving an orphaned identity with valid tokens and no accountable owner, a pattern seen repeatedly in the Ultimate Guide to NHIs.
- A middleware connector is granted broad roles to “make the deployment work,” then reused across environments without revalidation, echoing the issues highlighted in the Top 10 NHI Issues.
- An OAuth app or service principal accumulates delegated consent over time, so the original approval no longer matches the current business purpose, a failure mode often illustrated by the Salesloft OAuth token breach.
- A CI/CD pipeline stores extension credentials in configuration rather than a secrets manager, then spreads them into test and maintenance tooling, a risk pattern aligned with the NIST Cybersecurity Framework 2.0.
Why It Matters in NHI Security
Extension-layer drift matters because attackers rarely need to compromise the core platform first. They often target the surrounding identities, where access is broader, ownership is weaker, and review cadences are inconsistent. NHIMG research reports that 97% of NHIs carry excessive privileges and only 5.7% of organisations have full visibility into service accounts, which makes drift a practical security failure rather than a theoretical one. The same research also shows that 71% of NHIs are not rotated on time and 96% of organisations store secrets outside dedicated secrets managers, both of which amplify extension-layer risk.
For governance teams, this term helps connect platform administration to identity operations. It pushes reviews beyond the core tenant and into the integrations, delegated scopes, and lifecycle events that actually determine exposure. It also clarifies why Zero Trust programs often stall when they focus on perimeter policy but ignore the identities that operate inside and around the platform.
Organisations typically encounter this consequence only after a token leak, privilege misuse, or third-party incident exposes how much access the extension layer had accumulated, at which point extension-layer identity drift becomes operationally unavoidable to address.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0 and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 | Covers secret sprawl and unmanaged non-human credentials that drive extension-layer drift. |
| NIST CSF 2.0 | PR.AC-4 | Least-privilege access management directly applies to delegated permissions around the platform. |
| NIST Zero Trust (SP 800-207) | Zero Trust requires continuous verification of service identities and their access paths. |
Inventory extension identities, remove stale secrets, and enforce rotation and ownership review.
