diff --git a/addons/web_editor/static/src/js/wysiwyg/widgets/media.js b/addons/web_editor/static/src/js/wysiwyg/widgets/media.js
index 38db3565971..aa4467a5ee4 100644
--- a/addons/web_editor/static/src/js/wysiwyg/widgets/media.js
+++ b/addons/web_editor/static/src/js/wysiwyg/widgets/media.js
@@ -658,7 +658,7 @@ var FileWidget = SearchableMediaWidget.extend({
      * @private
      */
     _onURLInputChange: function () {
-        var inputValue = this.$urlInput.val();
+        const inputValue = this.$urlInput.val().split('?')[0];
         var emptyValue = (inputValue === '');
 
         var isURL = /^.+\..+$/.test(inputValue); // TODO improve
diff --git a/odoo/addons/base/models/ir_attachment.py b/odoo/addons/base/models/ir_attachment.py
index f87da94153d..4feb3e43f0a 100644
--- a/odoo/addons/base/models/ir_attachment.py
+++ b/odoo/addons/base/models/ir_attachment.py
@@ -283,7 +283,7 @@ class IrAttachment(models.Model):
         if not mimetype and values.get('name'):
             mimetype = mimetypes.guess_type(values['name'])[0]
         if not mimetype and values.get('url'):
-            mimetype = mimetypes.guess_type(values['url'])[0]
+            mimetype = mimetypes.guess_type(values['url'].split('?')[0])[0]
         if not mimetype or mimetype == 'application/octet-stream':
             raw = None
             if values.get('raw'):