diff --git a/.claude/settings.local.json b/.claude/settings.local.json
new file mode 100644
index 000000000..d676cd8a3
--- /dev/null
+++ b/.claude/settings.local.json
@@ -0,0 +1,29 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(xargs cat:*)",
+      "Bash(find:*)",
+      "Bash(go env:*)",
+      "Bash(git checkout:*)",
+      "Bash(git add:*)",
+      "Bash(git commit -m \"$\\(cat <<''EOF''\nfix\\(reearth/dev\\): use reearth-classic-account as REEARTH_DB_ACCOUNT in dev\n\nDev environment should use a separate account database \\(reearth-classic-account\\)\nto avoid MongoDB schema validation conflicts. Prod remains reearth-account.\n\n- Add reearth_db_account variable to reearth_classic_api module \\(default: reearth-account\\)\n- Set reearth_db_account to reearth-classic-account in dev reearth_classic_api\n- Set databases.account to reearth-classic-account in dev reearth_cloud\n\nCo-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>\nEOF\n\\)\")",
+      "Bash(git push:*)",
+      "Bash(gh pr create:*)",
+      "Bash(grep:*)",
+      "Bash(git commit -m \"$\\(cat <<''EOF''\nfix\\(reearth/dev\\): grant reearth role access to reearth-classic-account database\n\nThe classic API uses reearth-classic-account as DB_Account, but the\nreearth custom DB role only had permissions for reearth and\nreearth-account databases, causing MongoDB Unauthorized errors on\nuser lookups during authentication.\n\nCo-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>\nEOF\n\\)\")",
+      "Bash(gh pr close:*)",
+      "Bash(git fetch:*)",
+      "Bash(git cherry-pick:*)",
+      "Bash(gh pr edit:*)",
+      "Bash(gh pr view:*)",
+      "Bash(gh run list:*)",
+      "Bash(git pull:*)",
+      "Bash(git commit -m \"$\\(cat <<''EOF''\nfeat\\(reearth/dev\\): add reearth-classic-db role and revert reearth role\n\n- Revert the reearth custom role to remove reearth-classic-account\n  \\(the reearth-db secret uses reearth-visualizer user, not reearth\\)\n- Add new reearth-classic-db custom role with access to reearth and\n  reearth-classic-account databases for the classic API\n\nCo-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>\nEOF\n\\)\")",
+      "Bash(git commit:*)",
+      "Bash(gh run watch:*)",
+      "Bash(gcloud run services describe:*)",
+      "Bash(python3:*)",
+      "Bash(gcloud run revisions list:*)"
+    ]
+  }
+}
diff --git a/web/src/classic/components/pages/Authentication/ForcePasswordChange/index.tsx b/web/src/classic/components/pages/Authentication/ForcePasswordChange/index.tsx
new file mode 100644
index 000000000..23ab6069f
--- /dev/null
+++ b/web/src/classic/components/pages/Authentication/ForcePasswordChange/index.tsx
@@ -0,0 +1,42 @@
+import { useEffect } from "react";
+
+import Loading from "@reearth/classic/components/atoms/Loading";
+import { getAuthInfo } from "@reearth/services/config";
+
+const STORAGE_KEY = "reearth_password_change_state";
+
+const ForcePasswordChangePage: React.FC = () => {
+  useEffect(() => {
+    const params = new URLSearchParams(window.location.search);
+    const ticket = params.get("ticket");
+    const state = params.get("state");
+
+    if (ticket && state) {
+      // Coming from Auth0 Post-Login Action redirect.
+      // Save state to sessionStorage so we can resume the login flow after password change.
+      sessionStorage.setItem(STORAGE_KEY, state);
+      // Redirect to Auth0's password change page.
+      window.location.href = ticket;
+      return;
+    }
+
+    // Coming back from Auth0 password change page (result_url redirect).
+    const savedState = sessionStorage.getItem(STORAGE_KEY);
+    if (savedState) {
+      sessionStorage.removeItem(STORAGE_KEY);
+      const authInfo = getAuthInfo();
+      if (authInfo?.auth0Domain) {
+        // Redirect back to Auth0 to complete the login flow.
+        window.location.href = `https://${authInfo.auth0Domain}/continue?state=${savedState}`;
+        return;
+      }
+    }
+
+    // Fallback: redirect to top page.
+    window.location.href = "/";
+  }, []);
+
+  return <Loading />;
+};
+
+export default ForcePasswordChangePage;
diff --git a/web/src/services/routing/index.tsx b/web/src/services/routing/index.tsx
index 0e6420f84..10414e1cb 100644
--- a/web/src/services/routing/index.tsx
+++ b/web/src/services/routing/index.tsx
@@ -22,6 +22,9 @@ const LoginPage = lazy(() => import("@reearth/classic/components/pages/Authentic
 const PasswordResetPage = lazy(
   () => import("@reearth/classic/components/pages/Authentication/PasswordReset"),
 );
+const ForcePasswordChangePage = lazy(
+  () => import("@reearth/classic/components/pages/Authentication/ForcePasswordChange"),
+);
 
 const SignupPage = lazy(
   () => import("@reearth/classic/components/pages/Authentication/SignupPage"),
@@ -57,6 +60,10 @@ export const AppRoutes = () => {
       index: true,
       element: <RootPage />,
     },
+    {
+      path: "auth/force-password-change",
+      element: <ForcePasswordChangePage />,
+    },
     {
       path: "auth/*",
       element: <RootPage />,