How should security teams reduce duplicate SaaS subscriptions without losing control of access?

Why This Matters for Security Teams

Duplicate SaaS subscriptions are not just a procurement inefficiency. They create parallel identity stores, overlapping admin roles, and inconsistent offboarding paths that make access control harder to prove and easier to bypass. When the same business function exists in two apps, security teams often inherit two sets of entitlements, two audit trails, and two places where secrets or OAuth grants can persist after a team thinks an app has been retired.

This matters most when procurement, IT, and the business each believe a different system is authoritative. Without a single source of truth, access reviews become a formality, and redundant subscriptions quietly survive because no one owns the renewal decision. The issue is especially visible in SaaS ecosystems where third-party connections are common; NHIMG notes that 85% of organisations lack full visibility into third-party vendors connected via OAuth apps in The State of Non-Human Identity Security. That visibility gap is exactly where duplicate subscriptions turn into access sprawl.

Current guidance suggests treating app rationalisation as an identity control, not just a cost-cutting exercise. If the control plane for access is fragmented, duplication increases the chance that privileged accounts, stale OAuth grants, and unused licenses survive long after the business need has moved on. In practice, many security teams discover duplicate SaaS exposure only after a renewal, audit finding, or offboarding failure has already created unnecessary access risk.

How It Works in Practice

The most reliable approach is to build one application inventory that merges procurement records, SSO telemetry, usage logs, and owner assignments. That lets security teams determine which app is authoritative for each business function, then retire the redundant one or narrow it to a niche use case. For access control, the goal is not to freeze everything. The goal is to make the surviving application the only sanctioned path for users, admins, integrations, and service accounts.

In practice, this works best when app ownership is explicit and tied to renewal decisions. Security, IAM, and procurement can then standardise a few controls: require business justification for new app intake, flag duplicate categories during vendor review, and link deprovisioning to app retirement so access is removed when a subscription is cancelled. The OWASP Non-Human Identity Top 10 is relevant here because SaaS sprawl usually includes non-human access paths such as API tokens, app passwords, and OAuth grants.

• Use procurement data to identify every paid subscription, including shadow renewals.
• Use SSO and IdP logs to see which apps are actually in use and by whom.
• Use owner mapping to decide which app is authoritative for a business function.
• Revoke unused OAuth grants, API keys, and admin roles before cancelling duplicates.
• Feed the approved app list into renewals so duplicates are blocked by default.

NHIMG’s Ultimate Guide to NHIs is useful here because SaaS consolidation often exposes the same underlying NHI problems seen elsewhere: poor visibility, weak offboarding, and long-lived credentials. The operational objective is to ensure that reducing subscription count does not leave orphaned access behind.

These controls tend to break down in federated organisations where business units can buy apps independently and bypass central SSO, because the usage signals no longer cover the full SaaS estate.

Common Variations and Edge Cases

Tighter SaaS rationalisation often increases friction for business teams, requiring organisations to balance cost reduction against continuity, niche functionality, and local autonomy. There is no universal standard for this yet, so the right answer depends on whether the duplicate app is truly redundant or simply serving a different workflow with similar features.

Some edge cases need separate handling. A duplicate may be acceptable when one app is used for production and another for sandbox testing, or when legal, regional, or data residency constraints prevent consolidation. Best practice is evolving for M&A environments too, where temporary duplication is often unavoidable while identity systems are merged. The key is to put expiry dates on exceptions so “temporary” does not become permanent.

Security teams should also watch for hidden access paths after a consolidation decision. OAuth consents, SCIM connectors, service accounts, and delegated admin roles can outlive the visible subscription and continue to operate even after users stop logging in. That is why app rationalisation should be paired with a formal entitlement review and, where relevant, reference material such as the Ultimate Guide to NHIs and the Snowflake breach analysis, which illustrate how lingering access paths can become operational risk.

For organisations formalising this work, the most practical benchmark is simple: every approved app should have one owner, one renewal path, and one deprovisioning process. Anything else is a candidate for duplicate spend and duplicate access.

Related resources from NHI Mgmt Group

• How should security teams reduce SaaS access review overhead without losing audit evidence?
• How should security teams automate user access reviews without losing control quality?
• How should security teams automate access governance without losing control?
• How should security teams reduce MFA fatigue risk without weakening access control?