Security teams should combine application discovery, usage telemetry, and ownership data to find unused, underused, and orphaned apps. The goal is not just cost reduction. It is also to reduce access sprawl, remove stale accounts, and tighten governance around apps that no longer have a clear business need or accountable owner.
Why This Matters for Security Teams
Redundant SaaS applications are not just a procurement problem. They create hidden identity sprawl, orphaned administrator accounts, duplicated data flows, and unmanaged OAuth grants that linger long after a tool stops delivering value. Security teams that focus only on license counts miss the larger risk: every unnecessary app expands the number of places where secrets, tokens, and privileged access can accumulate.
This is why app rationalisation should be treated as an identity and exposure review, not a simple cost-cutting exercise. The Ultimate Guide to NHIs notes that only 5.7% of organisations have full visibility into their service accounts, which shows how often access persists even when ownership is unclear. That gap becomes more severe in SaaS estates because apps often retain API tokens, inbox rules, sync connectors, and third-party integrations after business use has declined. Current guidance from the OWASP Non-Human Identity Top 10 reinforces that unused identities and stale credentials are common paths to compromise.
In practice, many security teams discover redundant apps only after a stale integration or over-permissioned tenant has already been abused.
How It Works in Practice
The most reliable method is to combine three evidence streams: discovery, usage telemetry, and ownership data. Discovery tells security teams what is actually present, including SaaS apps connected through single sign-on, OAuth consent, browser extensions, shadow IT inventories, and finance records. Usage telemetry shows whether the app is actively serving a business process or merely receiving logins, API calls, or background sync activity. Ownership data ties each application to a responsible business unit, technical owner, and renewal sponsor so the question is not just "Is this app used?" but "Who can approve retention or removal?"
For SaaS environments, the key identity signals are often more important than the software title itself. Security teams should review active users, dormant accounts, privileged roles, OAuth scopes, service accounts, webhook subscriptions, and connected downstream systems. A dormant app with no users may still be important if it feeds a finance workflow, but a lightly used app with broad admin consent and no accountable owner is a strong candidate for retirement. This is where the State of Non-Human Identity Security is relevant: 85% of organisations lack full visibility into third-party vendors connected via OAuth apps, which means many redundant apps remain embedded in access chains that teams cannot see clearly.
Practitioners often use a simple triage model:
- Unused: no meaningful logins, transactions, or API activity within the review window.
- Underused: limited activity that does not justify the current license tier, scope, or privilege set.
- Orphaned: no clear owner, no renewal sponsor, or no documented business process.
- Consolidation candidate: overlaps with another approved tool and can be retired after migration.
Security and IT should then validate business dependencies before disabling anything, because some "inactive" apps only appear dormant due to seasonal or batch usage. The NIST Cybersecurity Framework 2.0 supports this kind of asset visibility and governance-driven decision making, while NIST SP 800-53 Rev. 5 aligns the work to account management, access enforcement, and configuration control. These controls tend to break down when SaaS usage is spread across subsidiaries, contractors, and one-time integrations because no single team can reliably prove whether the app is truly idle.
Common Variations and Edge Cases
Tighter SaaS rationalisation often increases operational overhead, requiring organisations to balance savings against workflow disruption and review effort. That tradeoff matters most in regulated or highly distributed environments, where app ownership is fragmented and usage data is incomplete.
One common edge case is the app that looks redundant but still underpins a hidden dependency, such as automated reporting, inbox routing, or an external partner integration. Another is the app with very low human usage but high machine-to-machine traffic, where removing it would break scripts, CI/CD jobs, or background synchronisation. Best practice is evolving here: there is no universal standard for treating low-activity SaaS as "safe to remove" without checking non-human access paths first.
Security teams should also distinguish between business redundancy and identity redundancy. Two apps may perform similar functions, but if one has far broader OAuth consent, more privileged admin roles, or several stale service accounts, it is the higher-risk target regardless of cost. The 52 NHI Breaches Analysis is a useful reminder that compromise often follows retained credentials and excessive access rather than obvious business misuse. For that reason, app retirement should include revoking tokens, removing delegated consent, deleting unused accounts, and documenting the disposition of data and integrations before the license is cancelled.
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, NIST SP 800-53 Rev 5 and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 | Redundant SaaS often leaves stale non-human identities and unused tokens behind. |
| NIST CSF 2.0 | ID.AM | Application discovery and ownership mapping are core asset management activities. |
| NIST SP 800-53 Rev 5 | AC-2 | Account lifecycle control is needed when removing dormant SaaS access paths. |
| NIST AI RMF | Governance and mapping help ensure the app removal process is accountable and risk-aware. | |
| CSA MAESTRO | SaaS sprawl often includes agent-like integrations and automated workflows that need lifecycle control. |
Track machine-driven SaaS integrations separately and remove them only after validating downstream dependencies.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on August 28, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
