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zitadel/apps
Max PeintnerandGitHub 92ea32a34d fix(login): use correct requestId with oidc_ prefix in Prompt.LOGIN + loginHint flow (#12376)
Closes #11946

# Which Problems Are Solved

- OIDC redirect is broken when `Prompt.LOGIN` + `loginHint` is used —
the user lands on `/signedin` instead of being redirected to the OIDC
client's callback URL (fixes #11946)

# How the Problems Are Solved

- In `handleOIDCFlowInitiation`, the `Prompt.LOGIN` + `loginHint` code
path was passing `authRequest.id` (raw ID without `oidc_` prefix) to
`sendLoginname`. Without the prefix, `completeFlowOrGetUrl` does not
recognize the flow as OIDC and falls through to the "Regular flow" path,
redirecting to `/signedin` instead of calling `createCallback`. Fixed by
using the `requestId` parameter which already carries the `oidc_`
prefix.

# Additional Changes

- Standardized all request ID references in `handleOIDCFlowInitiation`
to consistently use the `requestId` parameter instead of reconstructing
it with `` `oidc_${authRequest.id}` ``. This eliminates the
inconsistency that caused the bug and prevents similar issues in the
future.
- Removed a redundant `if (authRequest.id)` guard in the LDAP redirect
path, since `requestId` is always present as a required parameter.
- Added regression tests verifying that `sendLoginname` receives the
`requestId` with the `oidc_` prefix in the `Prompt.LOGIN` + `loginHint`
code path.
2026-07-03 14:18:01 +02:00
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