Could you please update your composer.json file?

[gammaire]

The dependency requirement is not updated and contains a potential vulnerability, as per below. Please update dependency to: "phpoffice/phpspreadsheet": "1.8.0"
Thanks.

CVE-2019-12331
moderate severity
Vulnerable versions: < 1.8.0
Patched version: 1.8.0
PHPOffice PhpSpreadsheet before 1.8.0 has an XXE issue. The XmlScanner decodes the sheet1.xml from an .xlsx to utf-8 if something else than UTF-8 is declared in the header. This was a security measurement to prevent CVE-2018-19277 but the fix is not sufficient. By double-encoding the the xml payload to utf-7 it is possible to bypass the check for the string ?<!ENTITY? and thus allowing for an xml external entity processing (XXE) attack.

CVE-2018-19277
high severity
Vulnerable versions: < 1.5.0
Patched version: 1.5.0
securityScan() in PHPOffice PhpSpreadsheet through 1.5.0 allows a bypass of protection mechanisms for XXE via UTF-7 encoding in a .xlsx file