A nonstandard application is a system that does not support common identity and security standards such as SAML or SCIM. These applications often require manual access handling, which makes governance harder and increases operational risk. They can exist across SaaS, on-premises, OT, legacy, and cloud environments.
Expanded Definition
A nonstandard application is one that does not natively support common identity and provisioning standards, which means teams cannot rely on automated federation, deprovisioning, or attribute sync in the usual way. In NHI operations, that often includes systems that sit outside a standard NIST Cybersecurity Framework 2.0 identity workflow and must be handled through custom scripts, APIs, or manual exceptions.
Definitions vary across vendors, because some teams use the term for any app without SAML or SCIM support, while others also include systems that technically support a standard but cannot enforce it consistently across tenants or environments. That distinction matters: a tool may be “supported” on paper yet still behave like a nonstandard application if onboarding, access review, and offboarding require human intervention. NHIMG guidance on the Ultimate Guide to NHIs — Standards emphasizes that standards coverage is not just a feature checklist, but a governance control point.
The most common misapplication is treating a one-time manual integration as harmless, which occurs when teams underestimate how quickly exceptions become persistent identity debt.
Examples and Use Cases
Implementing governance for a nonstandard application rigorously often introduces operational overhead, requiring organisations to weigh security consistency against the cost of custom administration and exception handling.
- A legacy finance system has no SCIM endpoint, so account creation and disabling are done through tickets and spreadsheet tracking.
- An on-premises OT platform supports local logins only, forcing teams to manage access outside normal federation and access-review workflows.
- A niche SaaS product offers SAML but no lifecycle automation, so access revocation still depends on manual confirmation after offboarding.
- A cloud-native internal tool exposes only proprietary APIs, so identity teams build custom provisioning code and monitor it as a control dependency.
- A contractor portal used by third parties cannot integrate with central IdP policies, so temporary access is granted through tightly bounded exceptions.
These cases align with the broader challenge described in Ultimate Guide to NHIs — Standards, where unsupported identity patterns create recurring manual work. For a standards-based reference point, the NIST Cybersecurity Framework 2.0 reinforces why identity governance should be repeatable, measurable, and auditable rather than ad hoc.
Why It Matters in NHI Security
Nonstandard applications are high-friction environments for NHI governance because service accounts, API keys, and automation identities often accumulate without lifecycle controls. That creates blind spots in provisioning, rotation, and offboarding, especially when access is maintained through manual workarounds instead of policy enforcement. NHIMG research shows that only 5.7% of organisations have full visibility into their service accounts, and that lack of visibility becomes more severe when applications sit outside standard identity tooling.
This matters because nonstandard applications often become the place where exceptions are normalized. When identities are created outside automated guardrails, review cycles get delayed, secrets remain valid too long, and privilege creep becomes harder to detect. The operational risk is not just technical; it is governance failure, because audit evidence, ownership, and accountability become fragmented across tickets, scripts, and tribal knowledge.
For practitioners, the relevant question is not whether the application is modern enough, but whether it can be governed as part of the identity control plane. Organisations typically encounter excessive access, stale credentials, or failed offboarding only after a breach, at which point the nonstandard application 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 and OWASP Agentic AI Top 10 address the attack and risk surface, while NIST CSF 2.0, NIST Zero Trust (SP 800-207) and NIST SP 800-63 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-01 | Nonstandard apps often force manual NHI onboarding and lifecycle handling. |
| NIST CSF 2.0 | PR.AC-1 | Identity and access management must remain controlled even when standards are missing. |
| NIST Zero Trust (SP 800-207) | AC-4 | Zero trust depends on continuous access enforcement, not exceptions for legacy apps. |
| NIST SP 800-63 | IAL2 | Identity assurance expectations still apply when application federation is unavailable. |
| OWASP Agentic AI Top 10 | A01 | Unsupported integrations can expose agent actions to weak access boundaries. |
Constrain agents interacting with nonstandard apps through least privilege and audit logging.
