cPanel, WHM emergency update fixes critical auth bypass bug

## Executive Summary A critical authentication-bypass vulnerability was disclosed in cPanel and WHM affecting most supported versions; cPanel released emergency updates for specific versions and advised administrators to run the update process (upcp --force) or upgrade unsupported installations. Hosting providers (e.g., Namecheap) temporarily blocked relevant ports while patches were applied; no technical details or public tracking identifier have been published, but successful exploitation could grant full control of hosting accounts or entire servers.