They fail when certification is treated as evidence collection rather than entitlement change. If app owners can attest but the system does not revoke or reduce access, the review has no security effect. Effective programmes connect the attestation result to a live change in the target application and verify that change actually occurred.
Why This Matters for Security Teams
access review workflows in SaaS often look complete on paper while leaving permissions unchanged in the target system. That gap matters because certifications are only useful when they drive revocation, downgrading, or reassignment of access. The problem is not the review itself, but the false assumption that an attestation equals enforcement. The 52 NHI Breaches Analysis shows how identity and credential control failures repeatedly turn into real incidents, especially when governance steps are disconnected from operational change.
Security teams also underestimate how often SaaS permissions are distributed across nested groups, delegated admins, and application-specific roles that do not map cleanly to a central IAM record. In that environment, reviewers may approve or deny access based on stale context, while the app continues to honor existing entitlements. The OWASP Non-Human Identity Top 10 is relevant here because the same governance weakness appears whenever identities are not tied to verifiable lifecycle enforcement. In practice, many security teams encounter review “completion” only after an audit asks for proof that access was actually removed.
How It Works in Practice
A review workflow only reduces risk when the certification result is connected to a change action in the SaaS control plane. That usually means the review platform, IAM system, or access governance tool must trigger deprovisioning, role reduction, group removal, or secret rotation, then verify the resulting state through the application’s API or audit logs. Current guidance suggests treating attestation as one step in a closed loop, not as the control outcome itself. This aligns with the governance intent behind the NHI Lifecycle Management Guide, which emphasizes that identity changes must be measured by their effect in the live system.
Practically, effective programmes usually include three checks:
- Does the reviewer have enough context to make a decision, such as business owner, entitlement description, and last-used evidence?
- Does a deny decision automatically remove the entitlement or disable the account?
- Does the system verify that the target SaaS application actually applied the change?
For SaaS environments, the hardest part is not generating review tickets but reconciling results across SCIM, SSO, app-native RBAC, and manual exceptions. The control should also distinguish between active use and dormant access, because an unused entitlement can still be exploitable through token replay, delegated access, or reused API credentials. Frameworks such as the OWASP Non-Human Identity Top 10 are useful because they push teams toward lifecycle control rather than paper compliance. These controls tend to break down when the SaaS app has no reliable admin API or when privileged access is managed by manual tenant-level exceptions that the review system cannot enforce.
Common Variations and Edge Cases
Tighter review automation often increases operational overhead, requiring organisations to balance enforcement speed against app integration complexity. That tradeoff becomes visible when SaaS products expose incomplete APIs, when a single entitlement maps to multiple backend permissions, or when business teams insist on broad shared roles for convenience.
One common edge case is exception-heavy environments where reviewers approve access for a project, but the entitlement later expands through nested groups or inherited roles. Another is applications that support revocation only at the account level, not the privilege level, which forces teams to choose between over-removal and residual risk. Best practice is evolving here: there is no universal standard for how much manual follow-up is acceptable, but the review outcome should still produce an auditable state change.
The most reliable programmes define success as verified removal, not attestation volume. When that is not possible, teams should document the limitation explicitly, track the residual exposure window, and prioritize systems where review decisions can be enforced automatically. The broader lesson from The State of Secrets in AppSec is that governance failures become materially worse when access paths remain live after a control claims closure. In practice, SaaS reviews fail most often in environments that rely on screenshots, spreadsheets, or ticket closures instead of API-verified entitlement changes.
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 address the attack and risk surface, while NIST CSF 2.0 and 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 | Reviews fail when live entitlement change is not enforced. |
| NIST CSF 2.0 | PR.AA-1 | Identity and access governance must be continuously validated. |
| NIST CSF 2.0 | PR.AC-4 | Least-privilege reviews are ineffective without entitlement removal. |
Verify review outcomes in the target app instead of treating approval as control completion.
