diff --git a/extensions/tags/src/TagValidator.php b/extensions/tags/src/TagValidator.php
index 5d75d7823..6a064341a 100644
--- a/extensions/tags/src/TagValidator.php
+++ b/extensions/tags/src/TagValidator.php
@@ -18,7 +18,7 @@ class TagValidator extends AbstractValidator
      */
     protected $rules = [
         'name' => ['required'],
-        'slug' => ['required', 'unique:tags'],
+        'slug' => ['required', 'unique:tags', 'regex:/^[^\/\\ ]*$/i'],
         'is_hidden' => ['bool'],
         'description' => ['string', 'max:700'],
         'color' => ['regex:/^#([a-f0-9]{6}|[a-f0-9]{3})$/i'],