fix(login): preserve OIDC request context during email verification (#11990)

# Which Problems Are Solved

When a user needed to verify their email during an OIDC login flow, the
requestId was lost, preventing the flow from completing with a redirect
back to the relying party.

# How the Problems Are Solved

In `sendVerification()`, the session cookie lookup used `"loginName" in
command` to decide whether to fall back to `user.preferredLoginName`.
Since the `loginName` property key always exists in the command object
(even when its value is undefined), the fallback was never triggered.
This caused the lookup to search for loginName === undefined, finding no
session — and ultimately redirecting to a dead-end success page.

- /authenticator/set redirect: Added missing requestId to the URL params
when redirecting users who need to set up a primary auth method.
- /verify/success page: Added a "Continue" button that re-enters the
login flow with requestId preserved, handling the edge case where no
session cookie exists (e.g. email link opened in a different browser).

apps/login/locales/ar.json

@@ -382,6 +382,7 @@
     "userIdMissing": "لم يتم تقديم userId!",
     "successTitle": "تم التحقق من المستخدم",
     "successDescription": "تم التحقق من المستخدم بنجاح.",
+    "successContinue": "متابعة",
     "setupAuthenticator": "إعداد المصادق",
     "verify": {
       "title": "التحقق من المستخدم",

apps/login/locales/de.json

@@ -383,6 +383,7 @@
     "userIdMissing": "Keine Benutzer-ID angegeben!",
     "successTitle": "Benutzer verifiziert",
     "successDescription": "Der Benutzer wurde erfolgreich verifiziert.",
+    "successContinue": "Weiter",
     "setupAuthenticator": "Authentifikator einrichten",
     "verify": {
       "title": "Benutzer verifizieren",

apps/login/locales/en.json

@@ -383,6 +383,7 @@
     "userIdMissing": "No userId provided!",
     "successTitle": "User verified",
     "successDescription": "The user has been verified successfully.",
+    "successContinue": "Continue",
     "setupAuthenticator": "Setup authenticator",
     "verify": {
       "title": "Verify user",

apps/login/locales/es.json

@@ -383,6 +383,7 @@
     "userIdMissing": "¡No se proporcionó userId!",
     "successTitle": "Usuario verificado",
     "successDescription": "El usuario ha sido verificado con éxito.",
+    "successContinue": "Continuar",
     "setupAuthenticator": "Configurar autenticador",
     "verify": {
       "title": "Verificar usuario",

apps/login/locales/fr.json

@@ -351,6 +351,7 @@
     "userIdMissing": "Aucun identifiant utilisateur fourni !",
     "successTitle": "Utilisateur vérifié",
     "successDescription": "L'utilisateur a été vérifié avec succès.",
+    "successContinue": "Continuer",
     "setupAuthenticator": "Configurer l'authentificateur",
     "verify": {
       "title": "Vérifier l'utilisateur",

apps/login/locales/it.json

@@ -383,6 +383,7 @@
     "userIdMissing": "Nessun userId fornito!",
     "successTitle": "Utente verificato",
     "successDescription": "L'utente è stato verificato con successo.",
+    "successContinue": "Continua",
     "setupAuthenticator": "Configura autenticatore",
     "verify": {
       "title": "Verifica utente",

apps/login/locales/ja.json

@@ -376,6 +376,7 @@
     "userIdMissing": "ユーザーIDが指定されていません！",
     "successTitle": "ユーザー確認完了",
     "successDescription": "ユーザーの確認が正常に完了しました。",
+    "successContinue": "続行",
     "setupAuthenticator": "認証の設定",
     "verify": {
       "title": "ユーザー確認",

apps/login/locales/nl.json

@@ -381,6 +381,7 @@
     "userIdMissing": "Geen gebruikers-ID opgegeven!",
     "successTitle": "Gebruiker geverifieerd",
     "successDescription": "De gebruiker is succesvol geverifieerd.",
+    "successContinue": "Doorgaan",
     "setupAuthenticator": "Authenticator instellen",
     "verify": {
       "title": "Gebruiker verifiëren",

apps/login/locales/pl.json

@@ -383,6 +383,7 @@
     "userIdMissing": "Nie podano identyfikatora użytkownika!",
     "successTitle": "Weryfikacja zakończona",
     "successDescription": "Użytkownik został pomyślnie zweryfikowany.",
+    "successContinue": "Kontynuuj",
     "setupAuthenticator": "Skonfiguruj uwierzytelnianie",
     "verify": {
       "title": "Zweryfikuj użytkownika",

apps/login/locales/ru.json

@@ -383,6 +383,7 @@
     "userIdMissing": "Не указан userId!",
     "successTitle": "Пользователь подтверждён",
     "successDescription": "Пользователь успешно подтверждён.",
+    "successContinue": "Продолжить",
     "setupAuthenticator": "Настроить аутентификатор",
     "verify": {
       "title": "Подтверждение пользователя",

apps/login/locales/tr.json

@@ -383,6 +383,7 @@
     "userIdMissing": "userId sağlanmadı!",
     "successTitle": "Kullanıcı doğrulandı",
     "successDescription": "Kullanıcı başarıyla doğrulandı.",
+    "successContinue": "Devam",
     "setupAuthenticator": "Kimlik doğrulayıcı kur",
     "verify": {
       "title": "Kullanıcıyı doğrula",

apps/login/locales/uk.json

@@ -383,6 +383,7 @@
     "userIdMissing": "userId не надано!",
     "successTitle": "Користувача підтверджено",
     "successDescription": "Користувача успішно підтверджено.",
+    "successContinue": "Продовжити",
     "setupAuthenticator": "Налаштувати автентифікатор",
     "verify": {
       "title": "Підтвердити користувача",

apps/login/locales/zh.json

@@ -383,6 +383,7 @@
     "userIdMissing": "未提供用户 ID！",
     "successTitle": "用户已验证",
     "successDescription": "用户已成功验证。",
+    "successContinue": "继续",
     "setupAuthenticator": "设置认证器",
     "verify": {
       "title": "验证用户",

apps/login/src/app/(login)/verify/success/page.tsx

@@ -1,6 +1,7 @@
 import { DynamicTheme } from "@/components/dynamic-theme";
 import { Translated } from "@/components/translated";
 import { UserAvatar } from "@/components/user-avatar";
+import { VerifySuccessContinue } from "@/components/verify-success-continue";
 import { getServiceConfig } from "@/lib/service-url";
 import { loadMostRecentSession } from "@/lib/session";
 import { getBrandingSettings, getUserByID } from "@/lib/zitadel";
@@ -13,7 +14,7 @@ export default async function Page(props: { searchParams: Promise<any> }) {
   const _headers = await headers();
   const { serviceConfig } = getServiceConfig(_headers);
 
-  const { loginName, organization, userId } = searchParams;
+  const { loginName, organization, userId, requestId } = searchParams;
 
   const branding = await getBrandingSettings({ serviceConfig, organization });
 
@@ -41,6 +42,20 @@ export default async function Page(props: { searchParams: Promise<any> }) {
     }
   }
 
+  // Build continue URL to re-enter the login flow with requestId preserved
+  let continueUrl: string | undefined;
+  if (requestId) {
+    const params = new URLSearchParams();
+    if (loginName || user?.preferredLoginName) {
+      params.set("loginName", loginName ?? user?.preferredLoginName ?? "");
+    }
+    if (organization) {
+      params.set("organization", organization);
+    }
+    params.set("requestId", requestId);
+    continueUrl = `/loginname?${params}`;
+  }
+
   return (
     <DynamicTheme branding={branding}>
       <div className="flex flex-col space-y-4">
@@ -64,7 +79,7 @@ export default async function Page(props: { searchParams: Promise<any> }) {
           )
         )}
       </div>
-      <div className="w-full"></div>
+      <div className="w-full">{continueUrl && <VerifySuccessContinue continueUrl={continueUrl} />}</div>
     </DynamicTheme>
   );
 }

apps/login/src/components/verify-success-continue.tsx

@@ -0,0 +1,27 @@
+"use client";
+
+import { useTranslations } from "next-intl";
+import { useRouter } from "next/navigation";
+import { Button, ButtonVariants } from "./button";
+
+type Props = {
+  continueUrl: string;
+};
+
+export function VerifySuccessContinue({ continueUrl }: Props) {
+  const router = useRouter();
+  const t = useTranslations("verify");
+
+  return (
+    <div className="mt-8 flex w-full flex-row items-center justify-end">
+      <Button
+        type="button"
+        variant={ButtonVariants.Primary}
+        onClick={() => router.push(continueUrl)}
+        data-testid="continue-button"
+      >
+        {t("successContinue")}
+      </Button>
+    </div>
+  );
+}

apps/login/src/lib/server/verify.test.ts

@@ -123,6 +123,100 @@ describe("sendVerification", () => {
     // Verify creation was attempted
     expect(mockCreateSessionAndUpdateCookie).toHaveBeenCalled();
   });
+
+  test("should include requestId in /authenticator/set redirect when provided", async () => {
+    // 1. No existing session cookie
+    mockGetSessionCookieByLoginName.mockResolvedValue(undefined);
+
+    // 2. No auth methods (user needs setup)
+    mockListAuthenticationMethodTypes.mockResolvedValue({
+      authMethodTypes: [],
+    });
+
+    // 3. Mock session creation success
+    mockCreateSessionAndUpdateCookie.mockResolvedValue({
+      session: {
+        id: "new-session-id",
+        factors: { user: { id: "user-1", loginName: "[email protected]", organizationId: "org-1" } },
+      },
+    });
+
+    const result = await sendVerification({
+      userId: "user-1",
+      code: "123456",
+      isInvite: false,
+      requestId: "oidc_auth-req-123",
+    });
+
+    // Expect redirect to include requestId
+    expect(result).toEqual({
+      redirect: expect.stringContaining("/authenticator/set?"),
+    });
+    const redirectUrl = (result as { redirect: string }).redirect;
+    const params = new URLSearchParams(redirectUrl.split("?")[1]);
+    expect(params.get("requestId")).toBe("oidc_auth-req-123");
+    expect(params.get("sessionId")).toBe("new-session-id");
+    expect(params.get("loginName")).toBe("[email protected]");
+  });
+
+  test("should NOT include requestId in /authenticator/set redirect when not provided", async () => {
+    // 1. No existing session cookie
+    mockGetSessionCookieByLoginName.mockResolvedValue(undefined);
+
+    // 2. No auth methods (user needs setup)
+    mockListAuthenticationMethodTypes.mockResolvedValue({
+      authMethodTypes: [],
+    });
+
+    // 3. Mock session creation success
+    mockCreateSessionAndUpdateCookie.mockResolvedValue({
+      session: {
+        id: "new-session-id",
+        factors: { user: { id: "user-1", loginName: "[email protected]", organizationId: "org-1" } },
+      },
+    });
+
+    const result = await sendVerification({
+      userId: "user-1",
+      code: "123456",
+      isInvite: false,
+      // no requestId
+    });
+
+    const redirectUrl = (result as { redirect: string }).redirect;
+    const params = new URLSearchParams(redirectUrl.split("?")[1]);
+    expect(params.get("requestId")).toBeNull();
+  });
+
+  test("should fall back to user.preferredLoginName for session cookie lookup when loginName is undefined", async () => {
+    // Simulate the email-link scenario: loginName is undefined but userId is provided
+    mockGetSessionCookieByLoginName.mockResolvedValue(undefined);
+    mockGetUserByID.mockResolvedValue({
+      user: { userId: "user-1", preferredLoginName: "[email protected]" },
+    });
+    mockListAuthenticationMethodTypes.mockResolvedValue({
+      authMethodTypes: [],
+    });
+    mockCreateSessionAndUpdateCookie.mockResolvedValue({
+      session: {
+        id: "new-session-id",
+        factors: { user: { id: "user-1", loginName: "[email protected]", organizationId: "org-1" } },
+      },
+    });
+
+    await sendVerification({
+      userId: "user-1",
+      code: "123456",
+      isInvite: false,
+      loginName: undefined, // explicitly undefined, like from email link
+    });
+
+    // The key assertion: session cookie lookup should use preferredLoginName as fallback
+    expect(mockGetSessionCookieByLoginName).toHaveBeenCalledWith({
+      loginName: "[email protected]",
+      organization: undefined,
+    });
+  });
 });
 
 describe("initialSendVerification", () => {

apps/login/src/lib/server/verify.ts

@@ -92,7 +92,7 @@ export async function sendVerification(command: VerifyUserByEmailCommand) {
   const user = userResponse.user;
 
   const sessionCookie = await getSessionCookieByLoginName({
-    loginName: "loginName" in command ? command.loginName : user.preferredLoginName,
+    loginName: command.loginName ?? user.preferredLoginName,
     organization: command.organization,
   });
 
@@ -156,6 +156,10 @@ export async function sendVerification(command: VerifyUserByEmailCommand) {
       params.set("loginName", session.factors?.user?.loginName);
     }
 
+    if (command.requestId) {
+      params.set("requestId", command.requestId);
+    }
+
     // set hash of userId and userAgentId to prevent attacks, checks are done for users with invalid sessions and invalid userAgentId
     const cookiesList = await cookies();
     const userAgentId = await getOrSetFingerprintId();