content::WebContents* GetWebContentsByFrameID(int render_process_id,
                                              int render_frame_id) {
  content::RenderFrameHost* render_frame_host =
      content::RenderFrameHost::FromID(render_process_id, render_frame_id);
  if (!render_frame_host)
    return NULL;
  return content::WebContents::FromRenderFrameHost(render_frame_host);
}

This category addresses vulnerabilities caused by flawed access control mechanisms, where incorrect permission settings allow unauthorized users to access restricted resources.