diff --git a/authentik/events/api/notification_transport.py b/authentik/events/api/notification_transport.py
index 25d48f3dc..26d56a12a 100644
--- a/authentik/events/api/notification_transport.py
+++ b/authentik/events/api/notification_transport.py
@@ -1,7 +1,10 @@
 """NotificationTransport API Views"""
+from typing import Any
+
 from drf_spectacular.types import OpenApiTypes
 from drf_spectacular.utils import OpenApiResponse, extend_schema
 from rest_framework.decorators import action
+from rest_framework.exceptions import ValidationError
 from rest_framework.fields import CharField, ListField, SerializerMethodField
 from rest_framework.request import Request
 from rest_framework.response import Response
@@ -29,6 +32,14 @@ class NotificationTransportSerializer(ModelSerializer):
         """Return selected mode with a UI Label"""
         return TransportMode(instance.mode).label
 
+    def validate(self, attrs: dict[Any, str]) -> dict[Any, str]:
+        """Ensure the required fields are set."""
+        mode = attrs.get("mode")
+        if mode in [TransportMode.WEBHOOK, TransportMode.WEBHOOK_SLACK]:
+            if "webhook_url" not in attrs or attrs.get("webhook_url", "") == "":
+                raise ValidationError("Webhook URL may not be empty.")
+        return attrs
+
     class Meta:
 
         model = NotificationTransport
diff --git a/authentik/events/models.py b/authentik/events/models.py
index ec2d4d63a..af5022b99 100644
--- a/authentik/events/models.py
+++ b/authentik/events/models.py
@@ -6,6 +6,7 @@ from typing import TYPE_CHECKING, Optional, Type, Union
 from uuid import uuid4
 
 from django.conf import settings
+from django.core.validators import URLValidator
 from django.db import models
 from django.http import HttpRequest
 from django.http.request import QueryDict
@@ -223,7 +224,7 @@ class NotificationTransport(models.Model):
     name = models.TextField(unique=True)
     mode = models.TextField(choices=TransportMode.choices)
 
-    webhook_url = models.TextField(blank=True)
+    webhook_url = models.TextField(blank=True, validators=[URLValidator()])
     webhook_mapping = models.ForeignKey(
         "NotificationWebhookMapping", on_delete=models.SET_DEFAULT, null=True, default=None
     )
diff --git a/authentik/events/tests/test_api.py b/authentik/events/tests/test_api.py
index be81c2462..5d9074bbd 100644
--- a/authentik/events/tests/test_api.py
+++ b/authentik/events/tests/test_api.py
@@ -4,7 +4,13 @@ from django.urls import reverse
 from rest_framework.test import APITestCase
 
 from authentik.core.models import User
-from authentik.events.models import Event, EventAction, Notification, NotificationSeverity
+from authentik.events.models import (
+    Event,
+    EventAction,
+    Notification,
+    NotificationSeverity,
+    TransportMode,
+)
 
 
 class TestEventsAPI(APITestCase):
@@ -41,3 +47,23 @@ class TestEventsAPI(APITestCase):
         )
         notification.refresh_from_db()
         self.assertTrue(notification.seen)
+
+    def test_transport(self):
+        """Test transport API"""
+        response = self.client.post(
+            reverse("authentik_api:notificationtransport-list"),
+            data={
+                "name": "foo-with",
+                "mode": TransportMode.WEBHOOK,
+                "webhook_url": "http://foo.com",
+            },
+        )
+        self.assertEqual(response.status_code, 201)
+        response = self.client.post(
+            reverse("authentik_api:notificationtransport-list"),
+            data={
+                "name": "foo-without",
+                "mode": TransportMode.WEBHOOK,
+            },
+        )
+        self.assertEqual(response.status_code, 400)