When Access Rules Stop Updating

Athelguard Editorial · Latest Insights

An access rule can remain visible after the mechanism that keeps it current has stopped. That is a different operational problem from a missing rule: yesterday’s permissions may still look plausible while no longer following today’s business decisions.

Microsoft’s Entra entitlement-management guidance, updated October 9, 2026, identifies a specific retirement taking effect on November 3. Automatic assignment policies using the memberOf rule operator are quarantined: the policies remain, but assignment processing stops and assignments are neither added nor removed until that operator is removed from the rule. Microsoft explicitly says automatic assignment policies that do not use memberOf are unaffected.

This is an earlier-announced change reaching its effective date, not a newly disclosed vulnerability or evidence of compromise. Microsoft’s related preview documentation, updated August 5, describes the operator as unsuitable for production use and warns about stale access when affected configurations stop updating.

Test Removal, Not Just Successful Access

Our interpretation is that an identity migration needs evidence in both directions. Demonstrating that an eligible person receives access does not establish that access disappears when eligibility ends.

Consider a hypothetical project team. One test identity joins the project; another leaves. A replacement rule might appear successful because the joining identity receives its package, while the departing identity’s assignment remains. The useful acceptance question is whether both transitions match the intended policy, including any approved retention period.

Replace the Dependency Deliberately

Microsoft provides a read-only discovery script for affected automatic assignment policies and recommends supported attribute-based rules where an equivalent exists. Where it does not, its guidance calls for an alternative assignment method before removing the existing policy, followed by validation of assignments. Removing a dependency without a replacement can interrupt legitimate access.

For a business evaluating the change, ask the responsible team to define the intended membership first. Then compare that expectation with observed assignments and access using controlled test identities. Record exceptions rather than assuming a matching member count means the correct people have access. Two lists can have the same size and contain different people.

A manual replacement also changes the operating model. Someone must own additions, removals and periodic review. Document that responsibility and the agreed response time; do not present an unmanaged static list as equivalent to working automation.

What the Evidence Should Establish

The assessment question is whether the intended access lifecycle still works after the change. Keep configuration records, test observations and unresolved cases distinct. A successful sign-in alone cannot answer that question.

This is a practical lens for Independent Technical Assessments, not a finding that any particular organization uses the affected preview. Scope the review to the actual rules and dependencies before drawing a conclusion.