Just-In-Time Access: Why JIT Is Replacing Traditional Privileged Access Models

In a traditional privileged access model, administrators have persistent access to the systems they manage. A senior Linux administrator might have root access to 200 servers at all times. A DBA might have permanent production database credentials in their password manager. A network engineer might have standing access to every firewall in the estate.

This approach is operationally convenient. When something needs attention at 2am, the engineer can act immediately without going through an approval process. When a batch of deployments is running, the operations team can move freely between systems without friction.

But standing privilege creates a security problem that is increasingly unacceptable in modern threat environments. An account with permanent broad access is valuable to an attacker at all times. If an administrator's credentials are compromised — through phishing, malware on their workstation, or a credential dump from a third-party breach — the attacker immediately has the same scope of access as that administrator. That access persists until someone notices the compromise, which in most organisations takes weeks or months.

Just-In-Time access is the principle that privileged access is granted dynamically, for a specific purpose, for a specific duration, and revoked automatically when the time window expires or the task is complete.

In a JIT model, the Linux administrator I described above has no standing access to production servers. When they need to perform maintenance on a specific server, they submit a request through the PAM platform specifying the system, the reason, and the duration needed. If the request is within policy (for example, a change request exists in the ITSM system and the time window is reasonable), access is granted automatically. For more sensitive operations or out-of-hours requests, it may require a second approver — a team lead or on-call security contact. At the end of the approved window, access is revoked and the credential that was provisioned is rotated.

There are several ways to implement JIT, and the right approach depends on the sensitivity of the systems involved and the operational culture of the team.

Policy-based auto-approval works well for routine operations during business hours. If an engineer submits a request that matches a defined pattern — a known system, a known requester with the right role, a standard maintenance window — the PAM platform grants access immediately based on policy. No human approver is needed. This preserves operational velocity while ensuring every access event is documented, time-bounded, and auditable.

Dual-approval workflows are appropriate for the most sensitive operations — production database changes, domain controller access, changes to security infrastructure, access to systems handling payment data or patient records. The requester must provide a justification; a designated approver must confirm the request before access is granted. The approval is logged alongside the session recording.

Break-glass access handles genuine emergencies when the normal approval chain is unavailable. The requester can grant themselves access with an elevated justification requirement; every break-glass event generates immediate alerts to the security team and the CISO. The full session is recorded and flagged for mandatory post-incident review.

Beyond the security benefits, JIT access has a compelling compliance story. SOC 2, PCI-DSS, and ISO 27001 all require demonstration of least privilege and periodic access reviews. With standing access, proving least privilege is difficult — you must manually review who has what access and whether it is still justified. With JIT, least privilege is structurally enforced: no access exists unless it has been explicitly granted for a justified purpose. Access reviews become audits of policy rather than inventories of standing accounts.

JIT also reduces the blast radius of credential compromise significantly. An attacker who obtains an admin's credentials when no active JIT session exists gains nothing they can immediately exploit. They must either trigger a JIT request (which generates alerts) or wait for a session to be active (which is time-limited and monitored).