Advisories for Composer/Phpoffice/Phpexcel package

PHPExcel XXE Vulnerability

PHPExcel before 1.8.0, as used in ownCloud Server before 5.0.15 and 6.0.x before 6.0.2, does not disable external entity loading in libxml, which allows remote attackers to read arbitrary files, cause a denial of service, or possibly have other impact via an XML External Entity (XXE) attack.

securityScan() in PHPOffice PhpSpreadsheet allows a bypass of protection mechanisms for XXE via UTF-7 encoding in a .xlsx file.