CVE-2024-45046: PhpSpreadsheet HTML writer is vulnerable to Cross-Site Scripting via style information
First published: Wed Aug 28 2024(Updated: )
### 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.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| composer/phpoffice/phpspreadsheet | <1.29.1 | 1.29.1 |
| composer/phpoffice/phpspreadsheet | >=2.0.0<2.1.0 | 2.1.0 |
| PHPOffice PhpSpreadsheet | <1.29.1 | |
| PHPOffice PhpSpreadsheet | >=2.0.0<2.1.0 |
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Reference Links
- https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-wgmf-q9vr-vww6
- https://github.com/PHPOffice/PhpSpreadsheet/pull/3957
- https://github.com/PHPOffice/PhpSpreadsheet/commit/f7cf378faed2e11cf4825bf8bafea4922ae44667
- https://nvd.nist.gov/vuln/detail/CVE-2024-45046
- https://github.com/advisories/GHSA-wgmf-q9vr-vww6 (Advisory)
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