chore: rebalance embedded login messaging and add hybrid-use framing#1327
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tomauth0 wants to merge 13 commits into
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chore: rebalance embedded login messaging and add hybrid-use framing#1327tomauth0 wants to merge 13 commits into
tomauth0 wants to merge 13 commits into
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avanscoy
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Jun 2, 2026
| ## Browser considerations | ||
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| Because cross-origin authentication is achieved using third-party cookies, disabling third-party cookies will make cross-origin authentication fail. Some browsers, such as the newest version of Firefox, disable third-party cookies by default, meaning that cross-origin authentication will not work for users on Firefox. The only way to make embedded login work for Firefox users is to use a <Tooltip tip="Custom Domain: Third-party domain with a specialized, or vanity, name." cta="View Glossary" href="/docs/glossary?term=custom+domain">custom domain</Tooltip>, as described below. | ||
| Modern browsers (including Firefox, Safari with ITP, and Chromium-based browsers) restrict or block third-party cookies by default for privacy reasons. Web applications relying on third-party cookies for cross-origin authentication may fail in those browsers. To make embedded login work reliably across browsers, configure your tenant so the application and Auth0 share a top-level domain. This is also considered a security best practice. |
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The best security practice might be confusing here. Maybe we can edit the last sentence to be something like:
Also, as a security best practice, we recommend using a custom domain or multiple custom domains with the same top-level domain.
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I've updated the wording here to hopefully be clearer
avanscoy
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Jun 2, 2026
avanscoy
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Jun 2, 2026
Remove anti-embedded language across embedded-login, universal-vs-embedded-login, cross-origin-authentication, native-login, passwordless best practices, lock/auth0js, and the brute-force playbook. Reframe trade-offs as architectural choices and clarify that Universal Login and Embedded Login are not mutually exclusive — the same app can use UL for primary sign-in plus embedded flows for factor enrollment, step-up, passkey registration, or account linking.
Co-authored-by: Amanda VS <amanda.vanscoy@auth0.com>
Co-authored-by: Amanda VS <amanda.vanscoy@auth0.com>
Remove anti-embedded language across embedded-login, universal-vs-embedded-login, cross-origin-authentication, native-login, passwordless best practices, lock/auth0js, and the brute-force playbook. Reframe trade-offs as architectural choices and clarify that Universal Login and Embedded Login are not mutually exclusive — the same app can use UL for primary sign-in plus embedded flows for factor enrollment, step-up, passkey registration, or account linking.
Co-authored-by: Amanda VS <amanda.vanscoy@auth0.com>
Co-authored-by: Amanda VS <amanda.vanscoy@auth0.com>
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Description
Remove anti-embedded language across embedded-login, universal-vs-embedded-login,
cross-origin-authentication, native-login, passwordless best practices,
lock/auth0js, and the brute-force playbook. Reframe trade-offs as architectural
choices and clarify that Universal Login and Embedded Login are not mutually
exclusive — the same app can use UL for primary sign-in plus embedded flows for
factor enrollment, step-up, passkey registration, or account linking.
Checklist
CONTRIBUTING.md.