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..64bfd98
--- /dev/null
+++ b/tests/test_auth_utils.py
@@ -0,0 +1,58 @@
+import sys
+from unittest.mock import MagicMock
+
+# Mock cache_db module before importing auth.utils
+mock_cache_db = MagicMock()
+mock_redis = MagicMock()
+mock_user = MagicMock()
+mock_cache_db.redis_client.redis_client = mock_redis
+mock_cache_db.models.User = mock_user
+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, jsonify
+from unittest.mock import patch
+from auth.utils import login_required, PasswordUtils, JWTUtils
+
+
+@pytest.fixture
+def app():
+    app = Flask(__name__)
+    app.config['SECRET_KEY'] = 'test-secret'
+
+    @app.route('/protected')
+    @login_required
+    def protected():
+        return jsonify({'message': 'success'})
+
+    return app
+
+
+def test_login_required_unauthorized_does_not_leak_details(app):
+    with app.test_request_context('/protected'):
+        with patch('auth.utils.verify_jwt_in_request', side_effect=RuntimeError("Sensitive DB internal error details")):
+            client = app.test_client()
+            response = client.get('/protected')
+
+            assert response.status_code == 401
+            json_data = response.get_json()
+            assert json_data == {'error': 'Unauthorized'}
+            assert 'details' not in json_data
+            assert 'Sensitive DB internal error details' not in str(json_data)
+
+
+def test_password_utils():
+    hashed = PasswordUtils.hash_password("securepassword123")
+    assert PasswordUtils.verify_password("securepassword123", hashed)
+    assert not PasswordUtils.verify_password("wrongpassword", hashed)
+
+
+def test_jwt_utils():
+    access, refresh = JWTUtils.create_tokens("123", "testuser")
+    assert access is not None
+    assert refresh is not None
+    payload = JWTUtils.decode_token(access)
+    assert payload['user_id'] == "123"
+    assert payload['username'] == "testuser"