diff --git a/src/calibre/gui2/dialogs/exim.py b/src/calibre/gui2/dialogs/exim.py
index 85fd80eebd..cf1e9e993d 100644
--- a/src/calibre/gui2/dialogs/exim.py
+++ b/src/calibre/gui2/dialogs/exim.py
@@ -253,6 +253,12 @@ class EximDialog(Dialog):
         path = choose_dir(self, 'choose-export-folder-for-import', _('Select folder with exported data'))
         if path is None:
             return
+        if not question_dialog(self, _('Are you sure?'), _(
+            'Importing calibre data means all libraries, settings, plugins, etc will be imported. This is'
+            ' a security risk, only proceed if the data you are importing was previously generated by you, using the calibre'
+            ' export functionality.'
+            )):
+            return
         try:
             self.importer = Importer(path)
         except Exception as e: