PostgreSQL 18 introduces native OAuth 2.0 support as an authentication method, allowing users and applications to connect to database servers using identity tokens from providers like Google or Auth0 instead of traditional passwords. Configuration requires adding OAuth to pg_hba.conf with issuer and scope parameters. Connections via psql can use oauth_issuer, oauth_client_id, and optionally oauth_token parameters. This centralizes identity management and reduces risks from static database passwords.
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