diff --git a/app/Controller/AppController.php b/app/Controller/AppController.php
index 715457783..c4a3512c9 100755
--- a/app/Controller/AppController.php
+++ b/app/Controller/AppController.php
@@ -1104,7 +1104,7 @@ class AppController extends Controller
     {
         $result = false;
         if (Configure::read('Plugin.CustomAuth_enable')) {
-            $header = Configure::read('Plugin.CustomAuth_header') ? Configure::read('Plugin.CustomAuth_header') : 'Authorization';
+            $header = Configure::read('Plugin.CustomAuth_header') ? Configure::read('Plugin.CustomAuth_header') : 'AUTHORIZATION';
             $authName = Configure::read('Plugin.CustomAuth_name') ? Configure::read('Plugin.CustomAuth_name') : 'External authentication';
             if (
                 !Configure::check('Plugin.CustomAuth_use_header_namespace') ||
diff --git a/app/Model/Server.php b/app/Model/Server.php
index 2c36b9b02..0a369f81f 100644
--- a/app/Model/Server.php
+++ b/app/Model/Server.php
@@ -7312,7 +7312,7 @@ class Server extends AppModel
                 'CustomAuth_header' => array(
                     'level' => 2,
                     'description' => __('Set the header that MISP should look for here. If left empty it will default to the Authorization header.'),
-                    'value' => 'Authorization',
+                    'value' => 'AUTHORIZATION',
                     'test' => 'testForEmpty',
                     'type' => 'string',
                     'null' => true
diff --git a/app/View/Users/view.ctp b/app/View/Users/view.ctp
index 51da8ac34..500ef57e2 100755
--- a/app/View/Users/view.ctp
+++ b/app/View/Users/view.ctp
@@ -90,7 +90,7 @@ if ($admin_view && $isSiteAdmin && $isTotp) {
     }
 
     if (Configure::read('Plugin.CustomAuth_enable') && !empty($user['User']['external_auth_key'])) {
-        $header = Configure::read('Plugin.CustomAuth_header') ?: 'Authorization';
+        $header = Configure::read('Plugin.CustomAuth_header') ?: 'AUTHORIZATION';
         $table_data[] = array(
             'key' => __('Customauth header'),
             'html' => sprintf(