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 |
| PhpSpreadsheet | <1.29.1 | |
| 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)
Frequently Asked Questions
What is the severity of CVE-2024-45046?
CVE-2024-45046 has a high severity rating due to the potential for arbitrary JavaScript injection.
How do I fix CVE-2024-45046?
To fix CVE-2024-45046, upgrade to PhpSpreadsheet version 1.29.1 or 2.1.0.
What type of vulnerability is CVE-2024-45046?
CVE-2024-45046 is a Cross-Site Scripting (XSS) vulnerability caused by improper sanitization of spreadsheet styling information.
Who is affected by CVE-2024-45046?
CVE-2024-45046 affects users of the PhpSpreadsheet library versions prior to 1.29.1 and between 2.0.0 and 2.1.0.
What is the impact of CVE-2024-45046?
The impact of CVE-2024-45046 allows an attacker to execute arbitrary JavaScript in the context of the affected web application.
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