Reproducing an OAuth Refresh-Token Rotation Race with Two Requests

Refresh-token rotation involves exchanging token A for token B while invalidating A. Concurrency complicates this, as two browser tabs or network clients can submit token A almost simultaneously, requiring the server to distinguish between a valid race and a replay attack.

Modeling the token family and ensuring that only one active child exists post-requests is crucial. The process must be atomic, with careful management of token reuse and status transitions to maintain security and integrity in OAuth implementations.