PHPSpreadsheet is a pure PHP library for reading and writing spreadsheet files. In affected versions `\PhpOffice\PhpSpreadsheet\Writer\Html` doesn't sanitize spreadsheet styling information such as font names, allowing an attacker to inject arbitrary JavaScript on the page. As a result an attacker may used a crafted spreadsheet to fully takeover a session of a user viewing spreadsheet files as HTML. This issue has been addressed in release version 2.1.0. All users are advised to upgrade. There are no known workarounds for this vulnerability.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| phpoffice/phpspreadsheet(Packagist) | 2.0.0 | 2.1.0 | N/A |
| phpoffice/phpspreadsheet(Packagist) | 0 | 1.29.1 | N/A |
| phpoffice/phpexcel(Packagist) | 0 | N/A | N/A |
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