bool Document::childTypeAllowed(NodeType type) const
{
    switch (type) {
    case ATTRIBUTE_NODE:
    case CDATA_SECTION_NODE:
    case DOCUMENT_FRAGMENT_NODE:
    case DOCUMENT_NODE:
    case TEXT_NODE:
        return false;
    case COMMENT_NODE:
    case PROCESSING_INSTRUCTION_NODE:
        return true;
    case DOCUMENT_TYPE_NODE:
    case ELEMENT_NODE:
        for (Node& c : NodeTraversal::childrenOf(*this)) {
            if (c.nodeType() == type)
                return false;
        }
        return true;
    }
    return false;
}

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