diff --git a/internal/api/security_regression_test.go b/internal/api/security_regression_test.go
index fdd72de34..38695f290 100644
--- a/internal/api/security_regression_test.go
+++ b/internal/api/security_regression_test.go
@@ -2723,6 +2723,20 @@ func TestPathTraversalBlockedForNonAPIPaths(t *testing.T) {
 	}
 }
 
+func TestSetupScriptIsPublicEvenWhenAuthConfigured(t *testing.T) {
+	cfg := newTestConfigWithTokens(t)
+	cfg.AuthUser = "admin"
+	cfg.AuthPass = "hashed"
+	router := NewRouter(cfg, nil, nil, nil, nil, "1.0.0")
+
+	req := httptest.NewRequest(http.MethodGet, "/api/setup-script", nil)
+	rec := httptest.NewRecorder()
+	router.Handler().ServeHTTP(rec, req)
+	if rec.Code != http.StatusBadRequest {
+		t.Fatalf("expected 400 for missing params on public setup script, got %d", rec.Code)
+	}
+}
+
 func TestOIDCLoginBypassesAuth(t *testing.T) {
 	cfg := newTestConfigWithTokens(t)
 	cfg.AuthUser = "admin"