IT teams should first decide whether the attribute belongs in the core directory or should be added only for the target application. If the app depends on a stable identity field, extend the directory carefully, then map the attribute through SSO or provisioning connectors so it stays synchronized. The goal is consistent user data, not one-off manual updates that drift over time.
When a SaaS App Needs an Attribute the Directory Does Not Yet Store
The practical question is whether the missing field is an enterprise identity attribute or just an application-specific extension. If it affects multiple systems, user lifecycle events, or access decisions, treat it as governed identity data. If it is only needed by one SaaS app and has no broader reuse, keep it scoped to that integration so the central directory does not become cluttered with one-off fields.
Central directories work best when they remain the authoritative source for stable identity facts, while application-specific data is added only when the business case is real. That distinction matters because the more places an attribute exists, the more likely teams are to create drift, inconsistent approvals, and conflicting values during provisioning or account updates.
When the attribute is genuinely part of the user’s core identity, extend the directory in a controlled way and define ownership for source, update logic, and validation. Then map that field through SSO or provisioning connectors so the SaaS app receives the same value automatically instead of relying on manual edits that are easy to miss and hard to audit.
How to Decide Whether the Attribute Belongs in the Core Directory
A good test is persistence and portability: if the data should follow the user across applications, survive re-provisioning, and remain consistent over time, it belongs closer to the directory. If it only exists because one vendor’s workflow needs it, the better design is usually to keep it outside the core profile and feed it only into that application.
Teams should also separate descriptive data from authoritative identity data. A department name, cost centre, or regional flag may be useful in many places, but not every field deserves the same governance as the identity record itself. The more sensitive the attribute is, or the more it influences access or entitlements, the more carefully it should be modeled, reviewed, and synchronized.
This is where identity governance discipline matters. The directory is not just a storage layer, it is a control point for consistency, provisioning, and downstream access decisions. When teams add attributes without a lifecycle rule, they often end up with hidden manual processes, brittle mappings, and a second source of truth inside the SaaS app.
How to Keep the SaaS Mapping Reliable Over Time
Once an attribute is added, the implementation should be treated as a controlled data flow, not a one-time setup. The directory field, the SSO claim, and the provisioning payload should all be aligned so the same value is used everywhere, with clear handling for missing values, defaults, and exceptions.
Change control is the main safeguard here. If the attribute changes format, meaning, or ownership, the mapping should be reviewed before the update reaches production. Otherwise, a field that looked harmless during onboarding can later become a source of failed logins, incorrect assignments, or silent data mismatches across systems.
Operationally, it helps to define one owner for the attribute and one system of record for each update path. That avoids the common failure mode where the SaaS admin edits a local profile, the directory still holds a different value, and the next sync overwrites the local fix without anyone noticing.
Risk and Threat Considerations
Custom attributes create risk when they become a shadow identity store, especially if the same field is used to drive access, workflow routing, or downstream authorization. Inconsistent values can cause the wrong user to receive access, or prevent the right user from being updated correctly during joiner, mover, and leaver events.
Failure mechanism: The attribute is created in one system, reused differently in another, and then allowed to drift because updates are manual, unsynchronised, or poorly governed.
Impact: The organisation gets inconsistent identity data, unreliable provisioning, and a higher chance of access errors, operational friction, and audit findings.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-53 Rev 5, OWASP ASVS and NIST CSF 2.0 set the technical controls, while ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | Covers managing identity-related values and their lifecycle across systems. |
| IA-9 — Service Identification and Authentication | Applies when SaaS integrations rely on synchronized identity data between systems. | |
| Recommendation — Define ownership and lifecycle rules for identity attributes that affect account updates and access paths. Use controlled system-to-system mappings to keep directory data and SaaS claims aligned. | ||
| ISO/IEC 27001:2022 | A.5.15 — Access control | Relevant where custom attributes influence access decisions or downstream authorization. |
| Recommendation — Restrict attribute changes and review mappings that can affect access outcomes. | ||
| OWASP ASVS | V8 — Authorization | Relevant when custom attributes flow into access checks or application authorization logic. |
| Recommendation — Ensure application decisions do not depend on unchecked or inconsistent user attributes. | ||
| NIST CSF 2.0 | PR.AA-05 — Access permissions and authorizations are managed, incorporating the principle of least privilege and separation of duties | Supports controlled assignment of data that can influence privileges or access. |
| Recommendation — Treat identity attributes used by SaaS apps as governed inputs to access control decisions. | ||
Practitioner Guidance
What to prioritise: Decide first whether the attribute is enterprise identity data or application-local metadata. If it affects more than one system or lifecycle step, it needs ownership, validation rules, and a sync path, not an ad hoc form field.
What to verify: Confirm where the value is authored, where it is stored, and which system is allowed to overwrite it. If those answers are unclear, the integration is not ready for production use.
Common mistake: Teams often add the field directly in the SaaS app because it is faster, then discover later that no one can keep it consistent across provisioning, audit, and recovery scenarios.
Practitioner takeaway: The right design is the one that makes the attribute’s ownership explicit and its updates repeatable; if a field matters enough to drive identity workflows, it matters enough to manage as governed data.
Related resources from NHI Mgmt Group
- How should security teams handle user identity consolidation across multiple SaaS and directory sources?
- How should security teams handle stale user and application records in SaaS governance programs?
- How should security teams handle risks from AI browser extensions?
- How should security teams govern Active Directory service accounts?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 28, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
