void Document::updateFocusAppearanceTimerFired(Timer<Document>*)
{
    Element* element = focusedElement();
    if (!element)
        return;
    updateLayout();
    if (element->isFocusable())
        element->updateFocusAppearance(m_updateFocusAppearanceSelectionBahavior);
}

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