They usually get centralised logins and basic access control, but still lack assurance over entitlement quality, SoD violations, and high-risk business actions. That gap often leads to excess access lingering after role changes, slower audits, and weak remediation when policies are violated. In practice, the environment looks controlled at the front end while risk continues inside the application.
Why IAM Alone Feels Controlled but Leaves SaaS and ERP Risk Behind
IAM centralises authentication and basic access control, which helps with login hygiene and coarse-grained permissions. It does not, by itself, tell you whether the right people still have the right entitlements, whether conflicting access was introduced, or whether sensitive business actions are being used in ways that violate policy. That is why the front end can look orderly while application risk remains embedded.
In SaaS and ERP, that gap matters because entitlement quality is often what determines whether a user can approve payments, change master data, export records, or bypass maker-checker expectations. The control problem is not just “can they log in?” but “can they still perform a risky action after a job change, exception, or temporary assignment?”
Identity governance closes the gap between access authentication and access assurance. A practical model is to treat IAM as the entry layer and IAM and IGA Basics as complementary disciplines: one establishes who can sign in, the other governs what they are allowed to keep, request, inherit, or lose over time.
What the Missing Governance Layer Usually Fails to Control
Without governance, organisations tend to rely on roles, groups, or application admin defaults as a proxy for business authorisation. That works until the application model diverges from the organisation chart, role mining is incomplete, or a temporary exception becomes permanent. Over time, excess access accumulates and separation-of-duties conflicts become harder to see because the system still appears consistent at the login layer.
This is especially visible in ERP environments, where business process integrity depends on whether one person can combine conflicting privileges across procurement, payments, vendor management, or journal adjustments. In SaaS applications, the same pattern shows up in administrative roles, sharing features, exports, and workflow overrides. A useful reference point is the Segregation of Duties (SoD) Guide, because SoD is often the first governance control to fail when IAM is treated as sufficient.
Governance also changes how quickly you can answer audit questions. IAM can prove that accounts exist and that sign-in is protected. Identity governance can prove who approved access, what entitlement was granted, why it exists, when it should be reviewed, and whether remediation happened after a violation. For teams comparing tooling or closing the operating model gap, the IGA Buyer’s Guide is useful because it frames lifecycle, reviews, roles, SoD, and connectors as one operating problem rather than separate tasks.
Why the Residual Risk Persists After SSO and Provisioning
The residual risk is not theoretical. Access often drifts after promotions, transfers, project assignments, or emergency exceptions, and those changes are common in both SaaS and ERP estates. When governance is absent, revocation is slower than provisioning, so users keep entitlements that no longer match their duties. The application may still be “working as designed,” but the business risk is already inside the control boundary.
The other persistent issue is that high-risk actions are often hidden inside ordinary-looking permissions. A user may not need full admin rights to create exposure, only enough entitlement to approve, post, export, share, or alter records in a way that breaks process controls. The Role Mining and Role Design Guide is relevant here because poorly designed roles often preserve inherited access instead of reflecting actual business tasks.
Where organisations operate many SaaS platforms, governance gaps compound through inconsistent connectors, different entitlement vocabularies, and incomplete logging of application-level actions. That is why the SaaS Security Guide matters: it connects access review, admin roles, drift, and offboarding to the practical reality that cloud applications can look standardised while their effective permissions are not.
Risk and Threat Considerations
When IAM is used without identity governance, the main exposure is not login failure, it is authorised misuse of valid access. Excess entitlements, SoD conflicts, and unreviewed exceptions create a reliable path for insider misuse, accidental policy breach, and post-compromise escalation inside SaaS and ERP platforms.
Failure mechanism: Access is granted centrally, but entitlement quality is not continuously validated against role changes, process conflicts, or business-critical actions, so stale or toxic permissions remain active.
Impact: Organisations face delayed detection of inappropriate access, slower audit closure, weak remediation, and higher likelihood that a legitimate account can carry out an unauthorised business action without immediate friction.
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 sets the technical controls, while ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | AC-2 — Account Management | Covers provisioning, review, and disabling of application access in SaaS and ERP. |
| AC-6 — Least Privilege | Directly addresses excess access and overbroad permissions left behind without governance. | |
| AU-6 — Audit Review, Analysis, and Reporting | Supports review of high-risk business actions and auditability in critical applications. | |
| Recommendation — Review and remove application entitlements that no longer match job duties. Constrain users to the minimum entitlements needed for current business tasks. Correlate application audit events to detect risky actions and policy violations. | ||
| ISO/IEC 27001:2022 | A.5.18 — Access rights | Requires controlled allocation, review, and removal of access rights over time. |
| A.5.15 — Access control | Applies to enforcing authorised access rules beyond basic login control. | |
| Recommendation — Recertify and revoke application access that no longer has a business need. Define and enforce application access rules that reflect business authorisation. | ||
Practitioner Guidance
What to verify: Confirm that every critical SaaS and ERP application has an owner for entitlements, SoD rules, and periodic access review, not just a login owner. If a team cannot produce evidence of who reviews high-risk access and who removes it, the control is incomplete even if SSO is in place.
Decision rule: If an application can approve, post, export, or change records that affect money, inventory, customers, or reporting, treat governance as mandatory rather than optional. IAM-only coverage is acceptable for convenience, but not for assurance over those workflows.
Practitioner takeaway: The practical test is whether the organisation can explain and defend each user’s business authority inside the application, not merely prove that the user can authenticate to it.
Related resources from NHI Mgmt Group
- Guide: NHI Lifecycle Management Guide
- How should organisations reduce SaaS spend without weakening identity governance?
- What breaks when organisations rely on IAM without identity threat detection?
- What breaks when organisations rely on IAM automation without policy governance?
- What breaks when organisations rely on SSPM without identity governance?