diff --git a/BaronSoftware.SSO/Features/LoginWindow/LoginWindow.xaml.cs b/BaronSoftware.SSO/Features/LoginWindow/LoginWindow.xaml.cs
index a4667f4..0c50f94 100644
--- a/BaronSoftware.SSO/Features/LoginWindow/LoginWindow.xaml.cs
+++ b/BaronSoftware.SSO/Features/LoginWindow/LoginWindow.xaml.cs
@@ -1,4 +1,5 @@
 using Microsoft.Web.WebView2.Core;
+using System.IO;
 using System.Threading;
 using System.Windows;
 using System.Windows.Threading;
@@ -29,7 +30,7 @@ namespace BaronSoftware.SSO
             {
                 try
                 {
-                    await webview.EnsureCoreWebView2Async();
+                    await webview.EnsureCoreWebView2Async(await CreateWebView2EnvironmentAsync());
                     webview.CoreWebView2.NavigationStarting += OnNavigationStarting;
                     webview.CoreWebView2.Navigate(_authorizeUrl);
                 }
@@ -95,7 +96,7 @@ namespace BaronSoftware.SSO
                 holder.Show(); // WebView2 초기화에 필요한 HWND 확보(화면 밖)
                 try
                 {
-                    await web.EnsureCoreWebView2Async();
+                    await web.EnsureCoreWebView2Async(await CreateWebView2EnvironmentAsync());
                     // DeleteAllCookies()는 즉시 반환이라, 디스크 반영 전에 Dispose되면 쿠키가 남아
                     // 다음 로그인이 SSO로 조용히 통과될 수 있다. 완료까지 await하는 ClearBrowsingDataAsync로
                     // SSO 세션 쿠키/사이트 데이터를 확실히 제거한다.
@@ -148,7 +149,7 @@ namespace BaronSoftware.SSO
 
                 try
                 {
-                    await web.EnsureCoreWebView2Async();
+                    await web.EnsureCoreWebView2Async(await CreateWebView2EnvironmentAsync());
                     web.CoreWebView2.NavigationStarting += OnNavStarting;
                     web.CoreWebView2.Navigate(endSessionUrl);
 
@@ -166,6 +167,12 @@ namespace BaronSoftware.SSO
                 }
             });
 
+        private static Task<CoreWebView2Environment> CreateWebView2EnvironmentAsync()
+        {
+            var userDataFolder = Path.Combine(Path.GetTempPath(), "BaronSSO", "WebView2");
+            return CoreWebView2Environment.CreateAsync(userDataFolder: userDataFolder);
+        }
+
         /// <summary>
         /// 호출 스레드(MTA/STA)와 무관하게, 전용 STA 스레드에서 자체 Dispatcher 메시지펌프를 돌려
         /// WPF/WebView2 UI 작업을 실행하고 그 결과를 Task로 반환한다.