Underused subscriptions waste budget, but the deeper risk is fragmentation. Overlapping tools create inconsistent access controls, duplicate data paths, and more places for misconfiguration to hide. When teams buy software without portfolio discipline, IT loses visibility into what is active, who can access it, and whether the application still supports current business needs.
How subscription sprawl becomes a security problem
Underused SaaS is not just a cost issue. It usually means the organisation has more tenants, admin consoles, OAuth apps, API keys, and user grants than it can consistently track. That widens the attack surface and makes it harder to know which services are still trusted, which ones still sync data, and which ones should already have been retired.
When ownership is unclear, dormant tools often keep their access paths alive. The result is less confidence in access reviews, weaker offboarding discipline, and more risk that old integrations remain valid long after the business has stopped relying on them, a pattern seen in incidents such as the Salesloft OAuth token breach and the BeyondTrust API key breach.
Fragmentation also weakens control quality. Different products often implement different permission models, logging formats, data retention rules, and administrative roles, so the same business process can be protected unevenly across tools. That makes policy enforcement inconsistent and creates blind spots in audit trails, especially where overlapping systems process the same customer, employee, or operational data.
Why overlapping tools raise operating risk
Overlapping tools create duplicate data flows, duplicate configuration points, and duplicate exceptions. Every duplicate path is another place where settings drift, conditional access diverges, or a connector is left more permissive than the primary system. The more overlap there is, the harder it becomes to answer basic operational questions such as which system is authoritative, which one should receive updates first, and which controls apply when tools disagree.
Operational risk rises when teams assume overlap is harmless because the tools appear interchangeable. In practice, two products that look similar on a feature sheet may not handle identity, session lifetimes, logging, segregation, or recovery the same way. During incidents, that difference can slow containment because responders must investigate multiple consoles and reconcile multiple sources of truth before they can make a reliable decision.
Overlapping subscriptions also make it easier for shadow IT to persist. A department may keep a niche tool active even after a standard platform exists, which fragments support, training, and troubleshooting. That increases the chance that users route sensitive work around approved controls simply because the alternate tool is still available and nobody has formally removed it.
What disciplined portfolio management changes
A software portfolio becomes safer when each subscription has a clear business owner, a documented purpose, and a defined retirement condition. That discipline reduces the number of live access paths, makes unused services easier to disable, and gives security teams a sharper view of where data is actually stored and moved.
Portfolio discipline also improves decision quality. If two tools overlap, teams can compare them on control maturity, data handling, logging, and administrative overhead instead of defaulting to whichever one was purchased most recently. That is where CIS Benchmarks and NIST SP 800-53 Rev 5 Security and Privacy Controls are useful reference points for control expectations around configuration, access, auditability, and system integrity.
Where SaaS overlaps with authentication, authorization, or connector governance, organisations should treat the environment as an access-management problem, not a software catalog problem. The most relevant controls are the ones that force accurate inventory, least privilege, and removal of stale access, including the guidance in NIST Cybersecurity Framework 2.0 and NIST AI Risk Management Framework when automation or AI-assisted procurement is part of the buying process.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
CIS Controls v8, NIST CSF 2.0 and NIST SP 800-53 Rev 5 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-1 — Inventory and Control of Enterprise Assets | SaaS sprawl is fundamentally an asset inventory and ownership problem. |
| CIS-5 — Account Management | Overlapping tools create excess accounts, stale access, and orphaned admin rights. | |
| Recommendation — Maintain an authoritative inventory of SaaS apps, owners, and enabled integrations. Disable unused accounts and remove standing access from retired SaaS subscriptions. | ||
| NIST CSF 2.0 | ID.AM-01 — Physical devices and systems within the organization are inventoried | The same inventory discipline applies to SaaS tools, tenants, and connected services. |
| PR.AA-01 — Identities and credentials are issued, managed, verified, revoked, and audited | Dormant subscriptions still expose credentials, tokens, and admin access paths. | |
| Recommendation — Build a complete inventory of active SaaS services and their business owners. Revoke credentials and tokens for SaaS tools that are no longer required. | ||
| NIST SP 800-53 Rev 5 | CM-8 — System Component Inventory | Tool overlap and shadow subscriptions require a trustworthy component inventory. |
| AC-6 — Least Privilege | Fragmented SaaS portfolios often overgrant access across duplicate tools. | |
| Recommendation — Track every SaaS platform, connector, and admin interface in a central inventory. Apply least privilege to each SaaS platform and retire excess permissions. | ||
Practitioner Guidance
What to prioritise: Start with the subscriptions that still have active credentials, admin rights, data connectors, or billing despite low usage. Those are the highest-risk items because the organisation is paying for both wasted spend and continued exposure.
What to verify: For every overlapping tool, confirm who owns it, what data it processes, which identities can reach it, and whether there is a documented retirement or consolidation decision. If none of those answers are easy to produce, the tool is already operating outside healthy governance.
Common mistake: Treating “unused” as “low risk.” A neglected subscription with a valid token, sync job, or shared admin role can be more dangerous than a heavily used, well-managed system because no one is watching it closely.
Practitioner takeaway: The security objective is not to minimise the number of tools at any cost, but to ensure every live subscription and integration has an owner, a purpose, and a control boundary that the organisation can actually enforce.
Related resources from NHI Mgmt Group
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 25, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
