Because SSO and MFA only cover interactive human authentication, not the full set of service accounts, secrets, and delegated machine credentials that operate outside login flows. If those identities are unmanaged, they can persist, multiply, and retain privilege without the same visibility that human access gets.
Why This Matters for Security Teams
SSO and MFA reduce risk at the human login boundary, but unmanaged identities live outside that boundary. Service accounts, API keys, workload tokens, and delegated credentials can keep working long after the owner forgets them, and they often bypass the same review, alerting, and conditional access controls applied to employees. That creates privilege that is real, persistent, and frequently invisible.
The risk is not theoretical. In NHI programmes, unmanaged credentials are often the gap between a clean access review and a real compromise path. NHIMG’s Ultimate Guide to NHIs highlights how lifecycle blind spots and poor inventory discipline keep these identities active after they should have been revoked. This aligns with the NIST Cybersecurity Framework 2.0 emphasis on asset visibility and risk management: you cannot secure what you cannot reliably discover.
For many organisations, the real problem is not weak human authentication. It is the accumulation of unmanaged machine access that silently expands blast radius, especially in cloud, CI/CD, and SaaS integrations. In practice, many security teams discover unmanaged identities only after a breach review exposes a credential that should have been retired months earlier.
How It Works in Practice
Unmanaged identities increase IAM risk because they create a second, less governed identity plane. Human users may authenticate through SSO and MFA, but applications, scripts, pipelines, and third-party integrations often rely on long-lived secrets or tokens that are issued once and then reused indefinitely. If those credentials are not tied to a lifecycle owner, expiration policy, and inventory process, they become standing access with no meaningful assurance that the current privilege is still justified.
Good practice starts with discovery and classification. Security teams should distinguish interactive human accounts from non-human identities, then map each secret or token to a workload, service, or business process. Current guidance suggests combining inventory with rotation, secret storage controls, and access reviews that are specific to machine identity rather than borrowed from human IAM. NHIMG’s NHI Lifecycle Management Guide is useful here because unmanaged risk is usually a lifecycle failure, not just a permissions failure.
- Assign ownership to every service account, token, and certificate.
- Replace static secrets with short-lived credentials where possible.
- Use vaulting, rotation, and revocation workflows that are automated, not manual.
- Log and alert on non-human authentication separately from human sign-in events.
For implementation, teams should treat non-human access as part of the broader control set described by the CISA Known Exploited Vulnerabilities Catalog mindset: reduce exposure, shrink persistence, and assume that any forgotten credential is eventually discoverable. These controls tend to break down in legacy environments where hardcoded secrets, shared service accounts, and unmanaged integrations cannot be rotated without application changes.
Common Variations and Edge Cases
Tighter control over machine identities often increases operational overhead, so organisations must balance security improvement against deployment friction. That tradeoff is especially visible in legacy systems, multi-cloud estates, and developer-led environments where credentials are embedded in code, pipelines, or vendor-managed automation.
There is no universal standard for this yet, but current best practice is evolving toward continuous inventory, ephemeral credentials, and policy enforced at request time rather than by manual exception. The 2024 Non-Human Identity Security Report is instructive: 88.5% of organisations said their non-human IAM practices lagged behind or merely matched their human IAM, showing that mature SSO and MFA programmes do not automatically extend to machine access. The same report also notes that 23.7% still share secrets through insecure methods such as email or messaging apps, which is a classic unmanaged identity symptom.
Edge cases matter. Some workloads need longer-lived certificates for availability, some vendors do not support modern federation, and some environments cannot yet eliminate shared accounts. In those cases, compensate with compensating controls: narrow scope, monitor usage, isolate workloads, and establish explicit expiry and owner review. In practice, unmanaged identities become most dangerous when teams assume SSO and MFA have already solved IAM, then leave machine access outside the governance model.
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 and CSA MAESTRO address the attack and risk surface, while NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-01 | Covers discovery and inventory of non-human identities, the core gap here. |
| NIST CSF 2.0 | ID.AM-1 | Asset inventory is essential when hidden machine identities bypass SSO and MFA. |
| CSA MAESTRO | MAESTRO addresses governance for autonomous and machine identities across workflows. |
Add non-human identities to asset inventories and review them on the same cadence as systems.
