void ResourceFetcher::addAdditionalRequestHeaders(ResourceRequest& request, Resource::Type type)
{
    if (!frame())
        return;

    if (request.cachePolicy() == UseProtocolCachePolicy)
        request.setCachePolicy(resourceRequestCachePolicy(request, type));
    if (request.targetType() == ResourceRequest::TargetIsUnspecified)
        determineTargetType(request, type);
    if (type == Resource::LinkPrefetch || type == Resource::LinkSubresource)
        request.setHTTPHeaderField("Purpose", "prefetch");

    context().addAdditionalRequestHeaders(document(), request, (type == Resource::MainResource) ? FetchMainResource : FetchSubresource);
}

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