Provider authorization is the explicit approval that lets one credential provider move passwords, passkeys, or other secrets to another provider. It is not just a login check; it is a consent step that confirms the transfer is intentional, the source and destination are allowed, and the user is present to approve the action.
In cyber security, this matters because credential migration is a high-risk trust boundary. If an attacker can trigger or hijack a transfer, they may redirect secrets to a malicious app, export data without consent, or abuse a legitimate session. Strong provider authorization helps prevent those failures by requiring device-level confirmation, clear prompts, and checks on which providers are approved. Defenders should treat it as a control point: limit approved providers, verify transfer destinations, and prefer flows that avoid file-based exports or silent background copying.