CVE-2024-47873

PhpSpreadsheet is a PHP library for reading and writing spreadsheet files. The XmlScanner class has a scan method which should prevent XXE attacks. However, prior to versions 1.9.4, 2.1.3, 2.3.2, and 3.4.0, the regexes used in the `scan` method and the findCharSet method can be bypassed by using UCS-4 and encoding guessing. An attacker can bypass the sanitizer and achieve an XML external entity attack. Versions 1.9.4, 2.1.3, 2.3.2, and 3.4.0 fix the issue.

The following products are affected by CVE-2024-47873 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2024-47873.

URL	Resource
https://github.com/PHPOffice/PhpSpreadsheet/blob/39fc51309181e82593b06e2fa8e45ef8333a0335/src/PhpSpreadsheet/Reader/Security/XmlScanner.php
https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-jw4x-v69f-hh5w
https://owasp.org/www-community/vulnerabilities/XML_External_Entity_(XXE)_Processing
https://www.w3.org/TR/xml/#sec-guessing-no-ext-info