diff --git a/Sense/server/app/sense/liveview/http.go b/Sense/server/app/sense/liveview/http.go
index 1e0c444..af8930f 100644
--- a/Sense/server/app/sense/liveview/http.go
+++ b/Sense/server/app/sense/liveview/http.go
@@ -61,6 +61,10 @@ func (m *Module) player(w http.ResponseWriter, r *http.Request) {
 	}
 	w.Header().Set("Content-Type", "text/html; charset=utf-8")
 	w.Header().Set("Cache-Control", "no-store")
-	w.Header().Set("Content-Security-Policy", "default-src 'none'; frame-src http: https:; style-src 'unsafe-inline'")
+	// This endpoint is the authenticated, same-origin wrapper loaded by the
+	// live-view page. Keep the global DENY policy everywhere else, and allow
+	// only Sense itself to embed this wrapper.
+	w.Header().Set("X-Frame-Options", "SAMEORIGIN")
+	w.Header().Set("Content-Security-Policy", "default-src 'none'; frame-ancestors 'self'; frame-src http: https:; style-src 'unsafe-inline'")
 	_ = playerTemplate.Execute(w, target)
 }
diff --git a/Sense/server/app/sense/liveview/http_test.go b/Sense/server/app/sense/liveview/http_test.go
new file mode 100644
index 0000000..96a05e9
--- /dev/null
+++ b/Sense/server/app/sense/liveview/http_test.go
@@ -0,0 +1,39 @@
+package liveview
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"yovision.local/sense/app/sense/media"
+)
+
+func TestPlayerAllowsOnlySameOriginEmbedding(t *testing.T) {
+	service, err := NewService("http://127.0.0.1:8889", time.Minute)
+	if err != nil {
+		t.Fatal(err)
+	}
+	route := media.Route{ID: "device:main", Path: "sense_device_main", Desired: "running", Actual: "ready"}
+	service.route = func(context.Context, string) (media.Route, error) { return route, nil }
+	service.refresh = func(context.Context, string) (media.Route, error) { return route, nil }
+	service.sessions["view_test"] = Session{ID: "view_test", RouteID: route.ID, ExpiresAt: time.Now().Add(time.Minute)}
+
+	req := httptest.NewRequest(http.MethodGet, "/api/v1/liveview/sessions/view_test/player", nil)
+	req.SetPathValue("id", "view_test")
+	res := httptest.NewRecorder()
+	NewModule(service).player(res, req)
+
+	if res.Code != http.StatusOK {
+		t.Fatalf("status = %d", res.Code)
+	}
+	if got := res.Header().Get("X-Frame-Options"); got != "SAMEORIGIN" {
+		t.Fatalf("X-Frame-Options = %q", got)
+	}
+	csp := res.Header().Get("Content-Security-Policy")
+	if !strings.Contains(csp, "frame-ancestors 'self'") {
+		t.Fatalf("Content-Security-Policy = %q", csp)
+	}
+}