Utilizing Firebase authentication across various platforms

Exploring the best approach to incorporate multiple authentication providers with Firebase in a Next.js application. As of September 15, 2023, Firebase implemented email enumeration protection across all projects. If a user originally registered using email/password and now attempts to log in using Google, Firebase will override the provider. While I have not experimented with other signup methods, how can I ensure that users who previously signed up via email/password are still able to register using Google and Apple while maintaining their password? Also, what happens when two SAML providers are utilized? For example, signing up with Google and logging in with Apple.

javascriptfirebasenext.jsfirebase-authenticationfirebase-security

Answer №1

As of September 15, 2023, Firebase has implemented email enumeration protection across all projects.

Indeed, starting from September 15, 2023, new Firebase projects come with default email enumeration protection activated.

In cases where a user signs up using email/password and later attempts to sign in using Google, Firebase overrides the provider.

This behavior is separate from email enumeration protection, as pointed out by @FrankvanPuffelen in their comment. It's a longstanding default mechanism established back in 2016. For more details, refer to the link below:

  • firebase, linkWithCredential to add new auth provider to an Account

Despite the presence of fetchSignInMethodsForEmail, it doesn't function when email enumeration protection is active.

Correct again. While enabling email enumeration protection enhances security for user authentication accounts in your Firebase project, it does restrict the use of the fetchSignInMethodsForEmail() method, which was formerly recommended for identifier-first approaches.

Although disabling email enumeration protection is possible for now, I advise against it as this option may become unavailable in the future.

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