Why do forgotten subscriptions create more than just financial waste?

Why This Matters for Security Teams

Forgotten subscriptions are rarely just a budgeting problem. In security terms, they often represent a live identity that was never fully retired, which can leave delegated admin access, OAuth grants, API keys, or data connectors active long after the business owner has moved on. That makes the real risk lifecycle failure, not software sprawl. NHI Management Group’s Ultimate Guide to NHIs notes that only 20% of organisations have formal processes for offboarding and revoking API keys, which helps explain why abandoned subscriptions so often remain reachable.

This is especially important because service accounts and machine-to-machine credentials do not age out automatically just because a contract ends. If the subscription is tied to cloud storage, collaboration tools, or automation platforms, the abandoned tenant can become an unmonitored path into sensitive systems. Incidents such as the Zacks Investment Research breach and the Schneider Electric credentials breach show how lingering access can turn administrative leftovers into operational exposure. In practice, many security teams discover this only after an account review, a vendor exit, or an incident response exercise has already exposed the gap.

How It Works in Practice

The core issue is that subscriptions often bundle identity, access, and data retention into one commercial relationship. When the subscription is forgotten, the organisation may still have authenticated sessions, delegated scopes, SSO trust, webhook tokens, or shared workspace permissions running underneath it. From a control perspective, that means the security team has to treat subscription offboarding like NHI lifecycle management, not procurement cleanup.

Current guidance aligns best with a simple sequence:

• Inventory every subscription that can authenticate to internal or SaaS systems.
• Map each one to the identities, tokens, and admin roles it uses.
• Revoke access first, then terminate billing and data retention paths.
• Confirm that secrets are rotated or invalidated, not just deleted from a portal.
• Record ownership so no subscription can survive without a named business and technical approver.

Identity guidance from NIST SP 800-63 Digital Identity Guidelines is useful here because it reinforces the need to bind authentication to identity assurance, while NHI-specific lifecycle thinking from NHI Management Group’s NHI reference helps teams focus on offboarding, rotation, and visibility. The practical goal is to ensure a forgotten contract cannot retain a valid credential path into production systems.

These controls tend to break down when subscriptions are provisioned outside central IAM, especially through departmental credit cards or developer self-service signups, because no one system has the complete access picture.

Common Variations and Edge Cases

Tighter subscription governance often increases operational overhead, requiring organisations to balance faster team autonomy against stronger retirement controls. That tradeoff becomes visible in environments with shadow IT, shared SaaS tenants, or vendor-managed integrations where the business owner is unclear.

There is no universal standard for this yet, but current guidance suggests treating these cases differently:

• Trial accounts should be auto-expired with explicit credential revocation.
• Production subscriptions should require formal offboarding and access attestation.
• Shared tools need separate ownership for billing, access, and data deletion.
• Third-party integrations should be reviewed for residual API tokens and delegated consent.

Security teams should also distinguish between a dormant subscription and a dormant identity. A subscription may look inactive while background jobs, service principals, or linked storage remain active. The same is true for backup copies and exported data, which can outlive the account and keep the risk alive. Where vendor portals do not expose full token or consent revocation, the organisation must rely on internal records and downstream log review rather than assuming a cancel button is sufficient. That gap is common in fast-moving SaaS environments with weak offboarding discipline.

Related resources from NHI Mgmt Group

• Why do unmanaged software licenses create identity risk as well as cost waste?
• Why do privacy laws create IAM obligations for financial services firms?
• Why do abandoned SaaS apps create more than just cost waste?
• Why do non-human identities create more audit risk than human accounts?