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advancedOAuth2 & OpenID Connect Deep Dive

What problem does OAuth2 solve that plain username/password sharing doesn't?

OAuth2 lets a user grant a third-party application LIMITED, SCOPED, and REVOCABLE access to their resources on another service, without ever sharing their actual account password with that third-party app. This avoids giving the third-party unlimited, permanent access and lets the user revoke just that one app's access independently.

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What problem does OAuth2 solve that plain username/password sharing doesn't?

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