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fix(clerk-js,ui): show the challenge raised while handing off to an enterprise connection - #9619

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Sep 24, 2026
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@zourzouvillys zourzouvillys commented Aug 31, 2026 •

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Description

A sign-in that uses an enterprise connection can be asked for a verification challenge at the point it hands off to the identity provider. When that happens the server returns before it has prepared the hand-off, so there is no external URL to follow.

SignIn.authenticateWithRedirect treated that response as invalid and threw a generic "not supported" error, and the sign-in dead-ended on an error the user cannot act on.

It now throws a ClerkRuntimeError with code protect_check_required instead. That keeps the method's contract of either navigating or throwing, so a caller that doesn't handle challenges gets an error it can recognise rather than a silent success. The prebuilt UI catches it at each place it starts the hand-off (the start page, the SSO bypass card, and in #9620 the enterprise connection picker and the resume after a challenge) and routes to the challenge. Once resolved, the hand-off is retried with continueSignIn and prepared for real.

The error is only thrown when there is nowhere to go. The server builds the redirect before it runs the check, so a challenged create can come back with a usable redirect as well. In that case the redirect is followed and the challenge runs when the sign-in returns from the identity provider, exactly as it does today. In practice the error comes from a challenged enterprise SSO prepareFirstFactor, which builds no redirect.

Effects and risks

  • OAuth and social sign-ins behave as today: a challenged create follows its redirect and the challenge runs on the callback.
  • Custom flows that call authenticateWithRedirect() or authenticateWithPopup() with Protect enabled can now catch protect_check_required. Previously they got a generic error in the same situation, so nothing that worked before breaks.
  • A newer clerk-js with an older @clerk/ui gets the error, as before this change, rather than stalling.
  • The error has a localized message for callers that show it rather than routing on it, such as the social buttons when there is no redirect to follow.
  • SignUp is unchanged; the sign-up side of the ordering is fix(shared): run a sign-up challenge before the enterprise hand-off #9622.
  • The start page now awaits one hand-off it previously returned from inside a try, so a failed hand-off reaches its error handling instead of escaping as an unhandled rejection.
  • No change when nothing is pending: the redirect is followed exactly as before.

Checklist

  • pnpm test runs as expected.
  • pnpm build runs as expected.
  • (If applicable) JSDoc comments have been added or updated for any package exports
  • (If applicable) Documentation has been updated

Type of change

  • 🐛 Bug fix
  • 🌟 New feature
  • 🔨 Breaking change
  • 📖 Refactoring / dependency upgrade / documentation
  • other:

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🦋 Changeset detected

Latest commit: 1d27dcc

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 23 packages
Name Type
@clerk/clerk-js Patch
@clerk/localizations Patch
@clerk/shared Patch
@clerk/ui Patch
@clerk/chrome-extension Patch
@clerk/electron Patch
@clerk/expo Patch
@clerk/react Patch
@clerk/astro Patch
@clerk/backend Patch
@clerk/expo-passkeys Patch
@clerk/express Patch
@clerk/fastify Patch
@clerk/hono Patch
@clerk/mosaic Patch
@clerk/msw Patch
@clerk/nextjs Patch
@clerk/nuxt Patch
@clerk/react-router Patch
@clerk/swingset Patch
@clerk/tanstack-react-start Patch
@clerk/testing Patch
@clerk/vue Patch

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@clerk/localizations

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@clerk/mosaic

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@clerk/nextjs

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@clerk/nuxt

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@clerk/react

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@clerk/react-router

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@clerk/tanstack-react-start

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@clerk/vue

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commit: 1d27dcc

@zourzouvillys
zourzouvillys marked this pull request as ready for review August 31, 2026 23:05
@zourzouvillys
zourzouvillys force-pushed the theo/enterprise-sso-challenge-redirect branch from 8e02a08 to 822801a Compare August 31, 2026 23:05
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  • packages/clerk-js/src/core/resources/SignIn.ts
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📝 Walkthrough

Walkthrough

Enterprise SSO sign-in redirect handling now pauses external navigation when a pending Protect challenge exists after sign-in creation or SSO preparation. The Sign-In UI awaits redirect authentication and routes pending challenges to protect-check. Tests cover challenge-gated and normal external redirect flows. A changeset declares patch releases for @clerk/clerk-js and @clerk/ui.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to e3715

This change routes users to verification challenges during enterprise sign-in handoff while preserving the existing redirect path when no challenge is present. No actionable merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 4 files. Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (4 passed)
Check name Status Explanation
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
Title check ✅ Passed The title clearly and concisely identifies the main change: showing verification challenges during enterprise SSO handoff.
Description check ✅ Passed The description directly explains the enterprise SSO handoff issue, the challenge handling changes, affected flows, risks, and testing status.
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API Changes Report

Generated by Break Check on 2026-09-24T21:20:13.741Z

Summary

Metric Count
Packages analyzed 19
Packages with changes 1
🔴 Breaking changes 0
🟡 Non-breaking changes 1
🟢 Additions 0

🤖 This report was reviewed by claude-sonnet-4-6.


@clerk/shared

Current version: 4.35.0
Recommended bump: MINOR → 4.36.0

Subpath ./internal/clerk-js/constants

🟡 Non-breaking Changes (1)

Modified: ERROR_CODES
// ... 23 unchanged lines elided ...
    readonly FRAUD_DEVICE_BLOCKED: "device_blocked";
    readonly FRAUD_ACTION_BLOCKED: "action_blocked";
    readonly PROTECT_CHECK_ALREADY_RESOLVED: "protect_check_already_resolved";
+   readonly PROTECT_CHECK_REQUIRED: "protect_check_required";
    readonly PROTECT_CHECK_TIMED_OUT: "protect_check_timed_out";
    readonly PROTECT_CHECK_UNSUPPORTED_ENVIRONMENT: "protect_check_unsupported_environment";
    readonly SIGNUP_RATE_LIMIT_EXCEEDED: "signup_rate_limit_exceeded";
// ... 3 unchanged lines elided ...

Static analyzer: Breaking change in variable ERROR_CODES: Type changed: {readonly FORM_IDENTIFIER_NOT_FOUND:"form_identifier_not_found";readonly FORM_PASSWORD_INCORRECT:"form_password_incorre… → {readonly FORM_IDENTIFIER_NOT_FOUND:"form_identifier_not_found";readonly FORM_PASSWORD_INCORRECT:"form_password_incorre…

🤖 AI review (reclassified as non-breaking) (97%): The only difference between before and after is the addition of a new PROTECT_CHECK_REQUIRED: "protect_check_required" property to the readonly object; all existing properties are unchanged, so no consumer code reading existing keys is broken.


Report generated by Break Check

Last ran on 1d27dcc.

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Actionable comments posted: 1

🧹 Nitpick comments (1)
packages/clerk-js/src/core/resources/__tests__/SignIn.test.ts (1)

328-334: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win

Cover the OAuth challenge with an external redirect URL.

The pending fixture has first_factor_verification: null and the new tests only invoke enterprise_sso. Add an OAuth case where a Protect challenge and external_verification_redirect_url are both present. Assert that authenticateWithRedirect does not navigate.

As per coding guidelines, “Unit tests are required for all new functionality.”

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only still-valid issues, skip the rest with a brief reason, keep changes
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In `@packages/clerk-js/src/core/resources/__tests__/SignIn.test.ts` around lines
328 - 334, Add a SignIn unit test covering the OAuth flow when a pending Protect
challenge includes an external_verification_redirect_url, alongside the existing
enterprise_sso coverage. Invoke authenticateWithRedirect and assert that
navigation is not performed, using the existing SignIn test fixtures and
helpers.

Source: Coding guidelines

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In `@packages/clerk-js/src/core/resources/SignIn.ts`:
- Around line 391-394: Update the pending Protect challenge comment near
continueSignIn to remove the incorrect claim that no external URL exists and
state tersely that navigation waits until the Protect challenge is resolved.

---

Nitpick comments:
In `@packages/clerk-js/src/core/resources/__tests__/SignIn.test.ts`:
- Around line 328-334: Add a SignIn unit test covering the OAuth flow when a
pending Protect challenge includes an external_verification_redirect_url,
alongside the existing enterprise_sso coverage. Invoke authenticateWithRedirect
and assert that navigation is not performed, using the existing SignIn test
fixtures and helpers.
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  • .changeset/enterprise-sso-hand-off-challenge.md
  • packages/clerk-js/src/core/resources/SignIn.ts
  • packages/clerk-js/src/core/resources/__tests__/SignIn.test.ts
  • packages/ui/src/components/SignIn/SignInStart.tsx
  • packages/ui/src/components/SignIn/__tests__/SignInStart.test.tsx
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Comment thread packages/clerk-js/src/core/resources/SignIn.ts Outdated

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I think this makes sense to me (Update: maybe not?), but I think we should group it with PR2 in this stack? This merging on its own creates a new gap, the one commented on:

// Defer external navigation while a challenge is pending: the caller resolves it and calls
// back in with `continueSignIn`.

There might technically be an issue with clerk-js<->ui version compatibility here too. If someone uses this new clerk-js version without the ui version from the next PR, authenticateWithRedirectOrPopup returns without navigation and everything stalls. Given this is a closed beta and we already have a bug, I think that's probably fine though.

Comment thread packages/ui/src/components/SignIn/SignInStart.tsx Outdated
Comment thread packages/clerk-js/src/core/resources/SignIn.ts
Comment thread packages/clerk-js/src/core/resources/SignIn.ts
Comment thread packages/clerk-js/src/core/resources/SignIn.ts
Comment thread packages/clerk-js/src/core/resources/SignIn.ts
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Thanks for the feedback, @Ephem. yup, agreed - i'll merge this and #9620 together rather than letting this one land on its own.

🤖 - on the clerk-js <-> ui skew: that's mostly gone now. authenticateWithRedirect throws a ClerkRuntimeError with code protect_check_required when a challenge stops it (b89fd34), instead of returning quietly. so a new clerk-js with an older ui gets an error, same as before this PR, rather than stalling. still not great, but it fails loudly instead of silently.

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Looking great, I like the changes!

Comment thread .changeset/enterprise-sso-hand-off-challenge.md Outdated
Comment thread packages/clerk-js/src/core/resources/SignIn.ts
zourzouvillys and others added 8 commits September 24, 2026 13:12
…nterprise connection

Preparing an enterprise SSO hand-off can return a pending verification
challenge, in which case the server returns before it builds a
verification and there is no external URL to follow. That response was
reported as invalid and the sign-in dead-ended with an error.

Return from the hand-off instead, and route to the challenge so it can
be resolved and the hand-off retried.

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
A challenge can coexist with an external redirect URL, so the comment's
claim that none exists was only true of the enterprise hand-off.

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
…cateWithRedirect

When Protect raises a challenge before the redirect, `authenticateWithRedirect`
returned without navigating, and every caller had to know to inspect the
sign-in afterwards. Callers that didn't were stuck or misled: the social
buttons sat on the card, custom flows saw a silent success, and the OAuth
transport failed with `oauth_transport_missing_verification_url`, which hid the
real reason.

It now throws a `ClerkRuntimeError` with code `protect_check_required`. That
keeps the method's contract of navigating or throwing, so a caller that
doesn't handle challenges gets an error it can recognise rather than a silent
success. Whether the user sees it depends on the caller: UI that drops errors
still needs to handle it. A caller that does handle it finds `protectCheck`
already set, routes to the challenge, and calls back in with `continueSignIn`.

The start page catches it itself, because its recovery path drops errors that
didn't come from the API.

SignUp is unchanged. It can legitimately navigate with a challenge still
outstanding, so throwing there would change the order the sign-up runs in.
The server builds the verification before it decides, so a sign-in create
that Protect challenges can come back with a usable identity-provider
redirect as well. Main follows it and runs the challenge on the way back,
where the OAuth/SSO callback routes to it. Stopping instead left OAuth and
social sign-ins with nowhere to go on any instance that challenges sign-in
creation.

Now:
- A challenged create with a redirect follows it.
- A challenged create without one throws `protect_check_required`.
- A challenged enterprise SSO prepare follows only the redirect this call's
  create built. The prepare builds no verification of its own, so anything
  else on the sign-in is from an earlier attempt and may be for another
  connection. Otherwise it throws.

The changeset scopes the recovery advice to enterprise SSO and mentions
`authenticateWithPopup`, which throws the same error.
…ing the raw error

A caller that can't run the challenge shows the error through the card. With
no localization for the code, that fell back to the formatted runtime error
message: `Clerk: A verification challenge… (code="protect_check_required")`.

Add the key, with an English message that tells the user what to do, and let
the generator fill it in as untranslated for the other locales. The social
buttons are the remaining place this can show, now that a challenged OAuth
create follows its redirect.
The SSO bypass card (from main) starts the enterprise hand-off itself, both
from its SSO action and from its connection list. A challenge raised while
preparing that hand-off now surfaces as `protect_check_required`. Without
handling, the card showed it as an error instead of taking the user to the
challenge. Route it, as the start page does.
…ror handling

`signInWithFields` returned the hand-off promise from inside its `try`
without awaiting it, so a rejected hand-off skipped the `catch` and escaped as
an unhandled rejection. The other two hand-off call sites already route
failures through the recovery path; this one now does too.

This was already true on main. The test for hand-off errors other than a
challenge surfaced it: the run reported every test passing but exited 1 on
the unhandled rejection.
Most readers use the prebuilt component and have nothing to do, so say that
first. Then say what a custom flow with Protect enabled should catch, and
only after that the details of the error.
@zourzouvillys
zourzouvillys force-pushed the theo/enterprise-sso-challenge-redirect branch from 86d35bf to 1d27dcc Compare September 24, 2026 21:15
@zourzouvillys
zourzouvillys merged commit 84ee588 into main Sep 24, 2026
85 of 86 checks passed
@zourzouvillys
zourzouvillys deleted the theo/enterprise-sso-challenge-redirect branch September 24, 2026 22:31

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