CVE-2025-22131

PhpSpreadsheet CVE-2025-22131 is an XSS in generateNavigation() during XLSX-to-HTML conversion when sheet names are not escaped for multi-sheet files. Affects PhpSpreadsheet versions prior to 2.2.2, 2.1.2, and 1.29.4; PoCs exist showing cookie-exfiltration via HTML navigation. Root cause: unsanit...