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Cybersecurity

Your Access List Is a Museum. Time to Clean It Out.

Retire stale access: Account inventory, Owner decision, Revocation test.
Centrien insights / Cybersecurity

Review what the account can still do

An access review needs more than a list of active employees. Supplier accounts, service identities, inherited permissions, and active sessions can preserve access after the original reason has ended.

Ask the resource owner to confirm the business need for each material privilege. Check dependencies before removal, then verify the result through the supported administrative path. Include an expiry for temporary exceptions and a way to restore essential access safely.

Put it into practice

Start with leavers, dormant administrators, vendor remote-access accounts, and shared credentials. Ask the service owner to confirm need. Disable safely before deletion where dependencies are uncertain, and verify that active sessions and tokens are revoked.

An access-review disposition list with keep, narrow, disable, exception, and recheck decisions: scope, rehearse, prove, and decide.
Operational playbook. An access-review disposition list with keep, narrow, disable, exception, and recheck decisions. Open full-size graphic

Implementation steps

  1. Inventory effective accessList people, workload identities, federation paths, local administrators, active tokens, and emergency accounts for a bounded service. Include inherited permissions and alternative access paths.
  2. Make a business decisionAsk the resource owner to keep, narrow, remove, or temporarily except each material privilege. A justified keep decision is valid; review quality is not measured by removals alone.
  3. Enforce and retestApply changes through the supported administrative path. Test necessary work and a denied action, then verify session or token revocation where relevant. Preserve emergency access without allowing an undocumented bypass.
  4. Operate the lifecycleConnect joiners, role changes, departures, workload retirement, and credential expiry to accountable owners. Recheck after service changes and use exception expiries to prevent temporary access becoming permanent.

Track owner coverage and privilege review completion

Measures that support an operational decision
Measure Calculation or definition How to use it
Owner coverage In-scope identities with a confirmed owner / in-scope identities Investigate orphaned workload and supplier identities.
Privilege review completion Permissions with recorded decisions / permissions in review scope Include keep decisions and unresolved dependencies.
Revocation verification Revocations with a successful denied-access test / revocations sampled Do not equate an admin-console change with an effective session boundary.

Identity ownership and verification

Worked example. Figures are illustrative.

Identity ownership and verification. Inventoried: 100; Owner confirmed: 80; Access tested: 65. Illustrative data.
Identity ownership and verification. 65 / 100 = 65% have tested access decisions. Ownership is known for 80; that leaves 15 owned identities still awaiting a test. Illustrative calculation. Open full-size graphic
Worked example — inputs
Observation Identities
Inventoried 100
Owner confirmed 80
Access tested 65

Measure the same identity population over a defined review period.

The record to keep

The deliverable: An access-review disposition list with keep, narrow, disable, exception, and recheck decisions.

Start with the service holding the most sensitive or consequential access. Close the loop on removal decisions by checking that the denied action really is denied.

References

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