From fbf38bbad741378f4d49cdef9b11b96b38501106 Mon Sep 17 00:00:00 2001
From: Arthur <worldnomad@gmail.com>
Date: Wed, 2 Nov 2022 08:31:57 -0700
Subject: [PATCH] 7376 validate tags

---
 netbox/netbox/forms/base.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/netbox/netbox/forms/base.py b/netbox/netbox/forms/base.py
index 5b7174e4e..c4bbd355f 100644
--- a/netbox/netbox/forms/base.py
+++ b/netbox/netbox/forms/base.py
@@ -1,5 +1,6 @@
 from django import forms
 from django.contrib.contenttypes.models import ContentType
+from django.core.exceptions import ValidationError
 from django.db.models import Q
 
 from extras.choices import CustomFieldFilterLogicChoices, CustomFieldTypeChoices, CustomFieldVisibilityChoices
@@ -75,6 +76,13 @@ class NetBoxModelCSVForm(CSVModelForm, NetBoxModelForm):
     def _get_form_field(self, customfield):
         return customfield.to_form_field(for_csv_import=True)
 
+    def clean_tags(self):
+        data = self.cleaned_data['tags']
+        existing_tags = Tag.objects.values_list('slug', flat=True)
+        for tag in data:
+            if tag.strip().lower() not in existing_tags:
+                raise ValidationError(f"Unknown tag: {tag}")
+
 
 class NetBoxModelBulkEditForm(BootstrapMixin, CustomFieldsMixin, forms.Form):
     """