diff --git a/include/labwc.h b/include/labwc.h
index 9abe32b2..d6bd36c1 100644
--- a/include/labwc.h
+++ b/include/labwc.h
@@ -374,6 +374,7 @@ void foreign_toplevel_update_outputs(struct view *view);
 void desktop_focus_and_activate_view(struct seat *seat, struct view *view);
 void desktop_arrange_all_views(struct server *server);
 void desktop_focus_output(struct output *output);
+struct view *desktop_topmost_mapped_view(struct server *server);
 
 enum lab_cycle_dir {
 	LAB_CYCLE_DIR_NONE,
diff --git a/src/desktop.c b/src/desktop.c
index 5a4acffa..bab5d725 100644
--- a/src/desktop.c
+++ b/src/desktop.c
@@ -200,8 +200,8 @@ desktop_cycle_view(struct server *server, struct view *start_view,
 	return NULL;
 }
 
-static struct view *
-topmost_mapped_view(struct server *server)
+struct view *
+desktop_topmost_mapped_view(struct server *server)
 {
 	struct view *view;
 	struct wl_list *node_list;
@@ -242,7 +242,7 @@ desktop_focused_view(struct server *server)
 void
 desktop_focus_topmost_mapped_view(struct server *server)
 {
-	struct view *view = topmost_mapped_view(server);
+	struct view *view = desktop_topmost_mapped_view(server);
 	desktop_focus_and_activate_view(&server->seat, view);
 	if (view) {
 		view_move_to_front(view);
diff --git a/src/xwayland-unmanaged.c b/src/xwayland-unmanaged.c
index a26a8f7d..9aaf42d6 100644
--- a/src/xwayland-unmanaged.c
+++ b/src/xwayland-unmanaged.c
@@ -166,6 +166,20 @@ unmanaged_handle_request_activate(struct wl_listener *listener, void *data)
 	struct xwayland_unmanaged *unmanaged = xsurface->data;
 	struct server *server = unmanaged->server;
 	struct seat *seat = &server->seat;
+
+	/*
+	 * Validate that the unmanaged surface trying to grab focus is actually
+	 * a child of the topmost mapped view before granting the request.
+	 */
+	struct view *view = desktop_topmost_mapped_view(server);
+	if (view && view->type == LAB_XWAYLAND_VIEW) {
+		struct wlr_xwayland_surface *surf =
+			wlr_xwayland_surface_from_wlr_surface(view->surface);
+		if (surf && surf->pid != xsurface->pid) {
+			return;
+		}
+	}
+
 	seat_focus_surface(seat, xsurface->surface);
 }