Runtime identity controls are security checks that verify identity and access during use, not just at sign-in. Instead of treating a successful login as a permanent pass, they keep evaluating the current user, service, device, session, and policy before each sensitive action. This is a core idea in zero trust: trust is continuously re-earned as context changes.
These controls matter because stolen passwords, session tokens, and valid accounts often look legitimate after authentication. Attackers can abuse that trust to move laterally, escalate privileges, or access data without triggering obvious login alarms. Defenders use runtime identity controls to shorten the value of stolen credentials through reauthentication, step-up checks, token revocation, least privilege, and short-lived workload identities. In cloud and microservice environments, they help ensure that a service remains authorized only for the actions it is currently supposed to perform.