OAuth 2.0 vs Session Management

Misinformation about the appropriate use of OAuth 2.0 often leads developers to confuse it with web session management, resulting in security issues. The key distinction between the two lies in the level of trust between communicating parties; session management typically involves a trusted backend and an untrusted frontend of the same app, while OAuth generally facilitates communication between two trusted backends of different apps. OAuth is suitable for scenarios where your app needs to interact with a third-party service, like using Google or Facebook for sign-in, whereas session management is more apt for internal communication within the same app. Both systems involve the use of tokens, but OAuth relies on short-lived access tokens and potentially long-lived refresh tokens, while session management can use either opaque tokens or JWTs. Ultimately, the core difference is one of trust, with OAuth enabling long-lived authenticated connections between trusted entities, and session management maintaining such connections between trusted and untrusted parties within the same application.