CVE-2024-45046

Description

### Summary `\PhpOffice\PhpSpreadsheet\Writer\Html` doesn't sanitize spreadsheet styling information such as font names, allowing an attacker to inject arbitrary JavaScript on the page. ### PoC Example target script: ``` <?php require 'vendor/autoload.php'; $reader = \PhpOffice\PhpSpreadsheet\IOFactory::createReader("Xlsx"); $spreadsheet = $reader->load(__DIR__ . '/book.xlsx'); $writer = new \PhpOffice\PhpSpreadsheet\Writer\Html($spreadsheet); print($writer->generateHTMLAll()); ``` Save this file in the same directory: [book.xlsx](https://github.com/PHPOffice/PhpSpreadsheet/files/15212797/book.xlsx) Open index.php in a web browser. An alert should be displayed. ### Impact Full takeover of the session of users viewing spreadsheet files as HTML.

How to fix CVE-2024-45046

To remediate CVE-2024-45046, upgrade the affected package to a fixed version below.

• —no fix listed
• —upgrade to 2.1.0 or later

Is CVE-2024-45046 being exploited?

Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, <= 1.8.2
• >= 2.0.0, < 2.1.0

CVSS scores

References (5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2024-45046
• PATCHgithub.com/PHPOffice/PhpSpreadsheet
• WEBgithub.com/PHPOffice/PhpSpreadsheet/commit/f7cf378faed2e11cf4825bf8bafea4922ae44667
• WEBgithub.com/PHPOffice/PhpSpreadsheet/pull/3957