Fixes #9950: Prevent redirection to arbitrary URLs via 'next' parameter on login URL

netbox/users/views.py

@@ -10,6 +10,7 @@ from django.http import HttpResponseRedirect
 from django.shortcuts import get_object_or_404, redirect, render
 from django.urls import reverse
 from django.utils.decorators import method_decorator
+from django.utils.http import url_has_allowed_host_and_scheme
 from django.views.decorators.debug import sensitive_post_parameters
 from django.views.generic import View
 from social_core.backends.utils import load_backends
@@ -91,7 +92,7 @@ class LoginView(View):
         data = request.POST if request.method == "POST" else request.GET
         redirect_url = data.get('next', settings.LOGIN_REDIRECT_URL)
 
-        if redirect_url and redirect_url.startswith('/'):
+        if redirect_url and url_has_allowed_host_and_scheme(redirect_url, allowed_hosts=None):
             logger.debug(f"Redirecting user to {redirect_url}")
         else:
             if redirect_url: