A refresh token is a credential used to obtain new access tokens without requiring the user or application to authenticate again each time. It matters because refresh tokens can quietly extend access if they are stolen or misused.
What is a Refresh Token?
Refresh tokens are typically longer-lived than access tokens and are used by a trusted client to request new access tokens after the originals expire. They help maintain usability while reducing how often a user must reauthenticate.
Why Refresh Tokens Matter for Security
Because their longer lifetime and role in renewing access can make them especially valuable to attackers. Strong storage, rotation, revocation, and monitoring are important.
Refresh Token vs. Access Token
A refresh token obtains new access tokens. An access token is presented directly to a service to authorize access.
Frequently Asked Questions
Why are refresh tokens sensitive?
Because they can keep issuing new access even after a short-lived access token expires.
How can teams protect refresh tokens?
By limiting lifetime, storing them securely, using revocation controls, detecting suspicious use, and reducing unnecessary scope.
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