diff --git a/portainer/rootfs/etc/nginx/templates/ingress.gtpl b/portainer/rootfs/etc/nginx/templates/ingress.gtpl
index 3a5b6dc22..1ea4de506 100644
--- a/portainer/rootfs/etc/nginx/templates/ingress.gtpl
+++ b/portainer/rootfs/etc/nginx/templates/ingress.gtpl
@@ -5,6 +5,8 @@ server {
   include /etc/nginx/includes/proxy_params.conf;
   client_max_body_size 0;
 
+  add_header Content-Security-Policy "frame-ancestors *";
+
   location / {
     proxy_pass {{ .protocol }}://backend/;
     resolver 127.0.0.11 valid=180s;