diff --git a/webservice/upload.php b/webservice/upload.php
index 1550ee5ffd8..9f34565672d 100644
--- a/webservice/upload.php
+++ b/webservice/upload.php
@@ -43,6 +43,10 @@ define('NO_MOODLE_COOKIES', true);
 
 require_once(__DIR__ . '/../config.php');
 require_once($CFG->dirroot . '/webservice/lib.php');
+
+// Allow CORS requests.
+header('Access-Control-Allow-Origin: *');
+
 $filepath = optional_param('filepath', '/', PARAM_PATH);
 $itemid = optional_param('itemid', 0, PARAM_INT);