An access exception is a documented, temporary deviation from the standard authentication policy, and it only stays controlled if it has a business justification, an owner, a scope, compensating controls, an expiry date, and a review cadence (the NHI Management Group glossary). When any of those is missing, the exception turns into an unaudited bypass.
The failure usually starts in the form. A requester writes "needs MFA exemption for testing" with no system named, no data described, and no end date. The reviewer has two options: approve on trust, or spend a week in email asking clarifying questions. Most reviewers, under pressure, approve.
The structural problem is that most organizations track access as a ticket, not as a risk decision. A generic ticketing system records that someone asked and someone said yes, but it does not force the requester to name what could go wrong or when the access must stop. Ticket systems "track requests" rather than govern access, and the gap is invisible until an audit or an incident surfaces it (Zluri's guide to access request management).
There is also a well-documented pattern of MFA being "enabled" while paths around it stay open. In one CISA and FBI advisory case, a state-sponsored actor exploited an account with default MFA settings to register a new device and get into an NGO's network (KirkpatrickPrice's analysis of the CISA advisory). Auditors repeatedly find developers connecting to production over SSH with no MFA while the automated check reports MFA as enforced. Exceptions are exactly where those paths live, so the form that creates them has to be as rigorous as the policy it steps around.



