diff --git a/app/Rules/Base64Mime.php b/app/Rules/Base64Mime.php
index 2e70fc15..35fd8384 100644
--- a/app/Rules/Base64Mime.php
+++ b/app/Rules/Base64Mime.php
@@ -32,11 +32,18 @@ class Base64Mime implements Rule
         $this->attribute = $attribute;
 
         try {
-            $data = json_decode($value)->data;
+            $decoded = json_decode(trim($value));
+            $name = !empty($decoded->name) ? $decoded->name : '';
+            $data = !empty($decoded->data) ? $decoded->data : '';
         } catch (\Exception $e) {
             return false;
         }
 
+        $extension = pathinfo($name, PATHINFO_EXTENSION);
+        if(!in_array($extension, $this->extensions)) {
+            return false;
+        }
+
         $pattern = '/^data:\w+\/[\w\+]+;base64,[\w\+\=\/]+$/';
 
         if (! preg_match($pattern, $data)) {