diff --git a/app/auth/callback/route.ts b/app/auth/callback/route.ts
index 1d8195b..4d1fc9a 100644
--- a/app/auth/callback/route.ts
+++ b/app/auth/callback/route.ts
@@ -4,7 +4,11 @@ import { createClient } from '@/lib/supabase/server';
 export async function GET(request: Request) {
   const { searchParams, origin } = new URL(request.url);
   const code = searchParams.get('code');
-  const next = searchParams.get('next') ?? '/mypage';
+  const rawNext = searchParams.get('next') ?? '/mypage';
+  const next =
+    rawNext.startsWith('/') && !rawNext.startsWith('//') && !rawNext.startsWith('/\\')
+      ? rawNext
+      : '/mypage';
 
   // 리다이렉트 기준 URL 결정
   // - dev: 항상 현재 request의 origin (localhost) → NEXT_PUBLIC_SITE_URL 무시
diff --git a/app/components/BankTransferModal.tsx b/app/components/BankTransferModal.tsx
index 2f3e000..331fa5d 100644
--- a/app/components/BankTransferModal.tsx
+++ b/app/components/BankTransferModal.tsx
@@ -82,6 +82,11 @@ export default function BankTransferModal({ product, isOpen, onClose }: Props) {
     };
   }, [isOpen, onClose]);
 
+  // 초기 포커스: 모달 열릴 때 닫기 버튼으로 포커스 이동
+  useEffect(() => {
+    if (isOpen) closeBtnRef.current?.focus();
+  }, [isOpen]);
+
   const handleSubmit = useCallback(
     async (e: React.FormEvent) => {
       e.preventDefault();
@@ -97,6 +102,11 @@ export default function BankTransferModal({ product, isOpen, onClose }: Props) {
         });
         const data = await res.json().catch(() => ({}));
         if (!res.ok) {
+          if (res.status === 401) {
+            setSubmitting(false);
+            setAuthState('guest');
+            return;
+          }
           setError(data?.error || '주문 처리 중 오류가 발생했습니다. 잠시 후 다시 시도해주세요.');
           setSubmitting(false);
           return;