diff --git a/auth/utils.py b/auth/utils.py
index 4bded89..a060433 100644
--- a/auth/utils.py
+++ b/auth/utils.py
@@ -128,8 +128,8 @@ def decorated_function(*args, **kwargs):
             g.user_id = user_id
             g.user = user_data
             return f(*args, **kwargs)
-        except Exception as e:
-            return jsonify({'error': 'Unauthorized', 'details': str(e)}), 401
+        except Exception:
+            return jsonify({'error': 'Unauthorized'}), 401
     return decorated_function
 
 
diff --git a/tests/test_auth_utils.py b/tests/test_auth_utils.py
new file mode 100644
index 0000000..6f0e5df
--- /dev/null
+++ b/tests/test_auth_utils.py
@@ -0,0 +1,65 @@
+import sys
+from unittest.mock import MagicMock
+
+# Mock external cache_db module before importing auth.utils
+mock_cache_db = MagicMock()
+mock_redis = MagicMock()
+mock_user = MagicMock()
+mock_refresh_token = MagicMock()
+
+mock_cache_db.redis_client.redis_client = mock_redis
+mock_cache_db.models.User = mock_user
+mock_cache_db.models.RefreshToken = mock_refresh_token
+
+sys.modules['cache_db'] = mock_cache_db
+sys.modules['cache_db.redis_client'] = mock_cache_db.redis_client
+sys.modules['cache_db.models'] = mock_cache_db.models
+
+import pytest
+from flask import Flask
+from auth.utils import login_required, PasswordUtils, JWTUtils
+
+
+@pytest.fixture
+def app():
+    app_inst = Flask(__name__)
+    app_inst.config['SECRET_KEY'] = 'test-secret'
+    app_inst.config['JWT_SECRET_KEY'] = 'test-secret'
+
+    @app_inst.route('/protected')
+    @login_required
+    def protected_route():
+        return {'message': 'success'}
+
+    return app_inst
+
+
+def test_login_required_unauthorized_does_not_leak_details(app, monkeypatch):
+    sensitive_error_msg = "Database connection string or internal trace details"
+
+    def mock_verify():
+        raise Exception(sensitive_error_msg)
+
+    monkeypatch.setattr('auth.utils.verify_jwt_in_request', mock_verify)
+
+    client = app.test_client()
+    response = client.get('/protected')
+
+    assert response.status_code == 401
+    json_data = response.get_json()
+    assert json_data == {'error': 'Unauthorized'}
+    assert sensitive_error_msg not in str(json_data)
+
+
+def test_password_utils():
+    hashed = PasswordUtils.hash_password("securepassword123")
+    assert PasswordUtils.verify_password("securepassword123", hashed) is True
+    assert PasswordUtils.verify_password("wrongpassword", hashed) is False
+
+
+def test_jwt_utils():
+    access_token, _ = JWTUtils.create_tokens("123", "testuser")
+    decoded = JWTUtils.decode_token(access_token)
+    assert decoded is not None
+    assert decoded['user_id'] == "123"
+    assert decoded['username'] == "testuser"