They assume tools built for software counting or cloud monitoring can replace identity governance. In practice, SAM and CASB provide partial visibility, but they do not fully manage application entitlements, revocation, or lifecycle accountability across SaaS.
Why This Matters for Security Teams
SAM and CASB often get deployed as evidence of SaaS control, but they answer different questions than identity governance. SAM is strongest for software inventory and licence optimisation, while CASB is strongest for visibility into SaaS usage and policy enforcement at the cloud edge. Neither tool, by itself, reliably owns entitlement lifecycle, revocation, or accountability across every tenant and app owner. The gap matters because SaaS access is frequently created outside central IT, then left in place long after need has changed.
That distinction is not theoretical. The NHIMG research on the Snowflake breach and the Salesloft OAuth token breach shows how quickly SaaS exposure becomes an identity problem when tokens, API keys, or delegated access outlive their intended use. NIST also frames governance as an ongoing risk management discipline in the NIST Cybersecurity Framework 2.0, not a one-time visibility exercise.
In practice, many security teams encounter SaaS sprawl only after a token leak, contractor offboarding failure, or shadow app exposure has already turned into an incident, rather than through intentional lifecycle governance.
How It Works in Practice
Effective SaaS control starts by separating three layers that are often conflated: asset visibility, access visibility, and entitlement governance. SAM can tell an organisation what software is procured or installed. CASB can reveal which SaaS services are being used, sometimes with inline policy enforcement. Neither tool usually becomes the system of record for who can do what inside Salesforce, Google Workspace, GitHub, or a line-of-business SaaS tenant.
That is why mature programmes connect CASB and SAM into a broader identity and SaaS governance model. The operational pattern is to ingest app inventories, map users and service accounts, then drive provisioning and deprovisioning through identity governance workflows, HR events, and application owners. For non-human access, the same logic applies to tokens, service principals, and API keys, which should be owned, scoped, rotated, and revoked like any other identity credential. The NHIMG Ultimate Guide to NHIs is explicit that lifecycle control and visibility are core governance functions, not optional hygiene.
- Use SAM to reconcile licences and contract exposure, not to prove entitlement correctness.
- Use CASB to discover usage patterns, unsanctioned apps, and risky sharing, not to replace access reviews.
- Use the IdP, HR system, and application owner workflows to enforce joiner, mover, and leaver decisions.
- Track OAuth grants, API tokens, and delegated admin roles as identities with ownership and expiry.
For implementation detail, policy should be evaluated at the point of change and not just during periodic audits. That aligns with modern zero-trust thinking in NIST guidance and with SaaS abuse patterns documented in NHIMG breach research such as the BeyondTrust API key breach, where leaked credentials became a path into downstream systems. These controls tend to break down in heavily decentralised SaaS estates where business units can create apps, grant OAuth consent, and reuse tokens without central review because no single team owns the full lifecycle.
Common Variations and Edge Cases
Tighter SaaS control often increases operational overhead, requiring organisations to balance governance coverage against user friction and administration cost. The tradeoff is real: central review reduces exposure, but overly rigid workflows can push users toward unsanctioned apps and bypasses.
Best practice is evolving on how much control belongs in CASB versus identity governance platforms. Some organisations use CASB mainly for discovery and DLP, then rely on IGA for entitlement reviews and deprovisioning. Others add SaaS management platforms to improve app inventory and licence optimisation. There is no universal standard for this yet, but the direction is consistent: control must follow the identity, not just the application.
Edge cases matter. In federated SaaS environments with multiple tenants, external collaborators, or API-heavy automation, licence records may look clean while active tokens and delegated permissions remain dangerously broad. The reverse also happens: a CASB may flag shadow usage, but without app-level ownership the alert cannot drive remediation. The NHIMG data point that only 5.7% of organisations have full visibility into service accounts underscores why these blind spots persist.
Security teams should treat SAM and CASB as inputs to a broader SaaS governance model, not as substitutes for it. That distinction becomes especially important when organisations rely on third-party integrations, because hidden OAuth grants can outlive employee access and survive routine reviews.
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 OWASP Agentic AI Top 10 address the attack and risk surface, while NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-03 | SaaS tokens and API keys need lifecycle control, rotation, and revocation. |
| OWASP Agentic AI Top 10 | Autonomous integrations and SaaS actions require runtime authorization and scoped access. | |
| NIST CSF 2.0 | PR.AC-4 | Access permissions management is the core gap when SAM and CASB are treated as governance tools. |
Inventory every SaaS token and key, assign ownership, and automate expiry, rotation, and revocation.
Related resources from NHI Mgmt Group
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on June 11, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
