diff --git a/.gitignore b/.gitignore
index 82d85fc..e314ca7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 node_modules/
 __pycache__/
 *.pyc
+*.bak*
 .env
 *.tar.gz
 uploads/
diff --git a/gateway/html/login.html b/gateway/html/login.html
index ccd0ba3..af399cb 100644
--- a/gateway/html/login.html
+++ b/gateway/html/login.html
@@ -161,7 +161,12 @@
 
                 // redirect 파라미터가 있으면 해당 URL로, 없으면 포털로
                 var redirect = new URLSearchParams(location.search).get('redirect');
-                window.location.href = redirect || '/';
+                // Open redirect 방지: 상대 경로 또는 같은 도메인만 허용
+                if (redirect && (redirect.startsWith('/') && !redirect.startsWith('//')) && !redirect.includes('://')) {
+                    window.location.href = redirect;
+                } else {
+                    window.location.href = '/';
+                }
             } catch (err) {
                 errEl.textContent = err.message;
                 errEl.style.display = '';
diff --git a/sso-auth-service/controllers/authController.js b/sso-auth-service/controllers/authController.js
index d88b468..04c2ada 100644
--- a/sso-auth-service/controllers/authController.js
+++ b/sso-auth-service/controllers/authController.js
@@ -65,14 +65,8 @@ async function login(req, res, next) {
       { expiresIn: JWT_REFRESH_EXPIRES_IN }
     );
 
-    // SSO 쿠키 설정 (동일 도메인 공유)
-    res.cookie('sso_token', access_token, {
-      httpOnly: true,
-      secure: process.env.NODE_ENV === 'production',
-      sameSite: 'lax',
-      maxAge: 7 * 24 * 60 * 60 * 1000, // 7 days
-      path: '/'
-    });
+    // SSO 쿠키는 클라이언트(login.html)에서 domain=.technicalkorea.net으로 설정
+    // 서버 httpOnly 쿠키는 서브도메인 공유 불가하므로 제거
 
     res.json({
       success: true,
@@ -237,14 +231,6 @@ async function refresh(req, res, next) {
       { expiresIn: JWT_REFRESH_EXPIRES_IN }
     );
 
-    res.cookie('sso_token', access_token, {
-      httpOnly: true,
-      secure: process.env.NODE_ENV === 'production',
-      sameSite: 'lax',
-      maxAge: 7 * 24 * 60 * 60 * 1000,
-      path: '/'
-    });
-
     res.json({
       success: true,
       access_token,
@@ -335,15 +321,11 @@ async function deleteUser(req, res, next) {
  * Bearer 토큰 또는 쿠키에서 토큰 추출
  */
 function extractToken(req) {
-  // Authorization header
+  // Authorization header (SSO 토큰은 항상 Bearer로 전달)
   const authHeader = req.headers['authorization'];
   if (authHeader && authHeader.startsWith('Bearer ')) {
     return authHeader.split(' ')[1];
   }
-  // Cookie
-  if (req.cookies && req.cookies.sso_token) {
-    return req.cookies.sso_token;
-  }
   return null;
 }
 
diff --git a/system2-report/api/index.js b/system2-report/api/index.js
index 4f9d8e8..6f270e7 100644
--- a/system2-report/api/index.js
+++ b/system2-report/api/index.js
@@ -45,31 +45,8 @@ app.get('/api/health', (req, res) => {
   res.json({ status: 'ok', service: 'system2-report', timestamp: new Date().toISOString() });
 });
 
-// JWT Auth middleware (SSO 공유 시크릿)
-const jwt = require('jsonwebtoken');
-const requireAuth = (req, res, next) => {
-  try {
-    const authHeader = req.headers['authorization'];
-    if (!authHeader) {
-      throw new AuthenticationError('Authorization 헤더가 필요합니다');
-    }
-    const token = authHeader.split(' ')[1];
-    if (!token) {
-      throw new AuthenticationError('Bearer 토큰이 필요합니다');
-    }
-    const decoded = jwt.verify(token, process.env.JWT_SECRET);
-    req.user = decoded;
-    next();
-  } catch (err) {
-    if (err.name === 'JsonWebTokenError' || err.name === 'TokenExpiredError') {
-      return res.status(401).json({ success: false, error: '유효하지 않은 토큰입니다' });
-    }
-    if (err instanceof AuthenticationError) {
-      return res.status(401).json({ success: false, error: err.message });
-    }
-    next(err);
-  }
-};
+// JWT Auth middleware (middlewares/auth.js 사용)
+const { requireAuth } = require('./middlewares/auth');
 
 // Routes
 const workIssueRoutes = require('./routes/workIssueRoutes');
@@ -77,6 +54,11 @@ const workIssueRoutes = require('./routes/workIssueRoutes');
 // 인증이 필요한 API
 app.use('/api/work-issues', requireAuth, workIssueRoutes);
 
+// 404 (에러 핸들러보다 먼저 등록)
+app.use((req, res) => {
+  res.status(404).json({ success: false, error: 'Not Found', path: req.originalUrl });
+});
+
 // Error handler
 app.use((err, req, res, next) => {
   const statusCode = err.statusCode || 500;
@@ -87,11 +69,6 @@ app.use((err, req, res, next) => {
   });
 });
 
-// 404
-app.use((req, res) => {
-  res.status(404).json({ success: false, error: 'Not Found', path: req.originalUrl });
-});
-
 app.listen(PORT, () => {
   console.log(`System 2 (신고) API running on port ${PORT}`);
 });