{"id":"GHSA-wv23-996v-q229","aliases":["CVE-2024-56410"],"title":"PhpSpreadsheet has a Cross-Site Scripting (XSS) vulnerability in custom properties","description":"# Cross-Site Scripting (XSS) vulnerability in custom properties\n\n**Product**: Phpspreadsheet\n**Version**: version 3.6.0\n**CWE-ID**: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')\n**CVSS vector v.3.1**: 5.4 (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N)\n**CVSS vector v.4.0**: 4.8 (AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N)\n**Description**: the HTML page is generated without clearing custom properties\n**Impact**: executing arbitrary JavaScript code in the browser\n**Vulnerable component**: class `PhpOffice\\PhpSpreadsheet\\Writer\\Html`, method `generateMeta`\n**Exploitation conditions**: a user viewing a specially generated Excel file\n**Mitigation**: additional sanitization of special characters in a string\n**Researcher**: Aleksey Solovev (Positive Technologies)\n\n# Research\n\nThe researcher discovered zero-day vulnerability Cross-Site Scripting (XSS) vulnerability in custom properties in Phpspreadsheet.\nThe following code is written on the server, which translates the XLSX file into a HTML representation and displays it in the response.\n\n*Listing 9. Source code on the server*\n\n```\n<?php\n\nrequire __DIR__ . '/vendor/autoload.php';\n\n$inputFileName = './doc/Book1.xlsx';\n$spreadsheet = \\PhpOffice\\PhpSpreadsheet\\IOFactory::load($inputFileName);\n$writer = new \\PhpOffice\\PhpSpreadsheet\\Writer\\Html($spreadsheet);\nprint($writer->generateHTMLAll());\n```\n\nAn attacker can embed a payload in a file property that will result in the execution of arbitrary JavaScript code.\nThe Excel file is unpacked and a custom property in the file is inserted into the `docProps/custom.xml` file.\n\n![fig17](https://github.com/user-attachments/assets/65453b48-bca5-4f5c-a683-315a7bb1ab1f)\n\n*Figure 17. Embedding the payload*\n\nAfter making the changes, a new archive with the xlsx extension was created. At the moment of converting the xlsx file into an HTML representation, a property is obtained that participates in the formation of a string without sanitization.\n\n![fig18](https://github.com/user-attachments/assets/e0f63bfb-d9e1-4c9d-a2a9-8a0a20406cdc)\n\n*Figure 18. Getting a custom property*\n\nWhen calling the static `generateMeta` method, you can see that the key of the custom property is displayed without sanitization.\n\n![fig19](https://github.com/user-attachments/assets/8c74e264-af68-4f62-8ac7-437e65884e86)\n\n*Figure 19. Getting a custom property*\n\nAs a result, when viewing the excel file as the HTML representation, arbitrary JavaScript code will be executed.\n\n<img width=\"356\" alt=\"fig20\" src=\"https://github.com/user-attachments/assets/a6ed21e3-685c-415c-b2dc-453bc0652bef\" />\n\n*Figure 20. Executing arbitrary JavaScript code*\n\n# Credit\nThis vulnerability was discovered by **Aleksey Solovev (Positive Technologies)**","severity":"medium","score":5.4,"published":"2025-01-03T17:25:45.000Z","modified":"2025-03-06T18:37:39.563Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"phpoffice/phpspreadsheet","ranges":[{"events":[{"introduced":"3.0.0"},{"fixed":"3.7.0"}],"type":"ECOSYSTEM"}],"versions":["3.3.0","3.4.0","3.5.0","3.6.0"],"fixed":["3.7.0"]},{"ecosystem":"Packagist","name":"phpoffice/phpspreadsheet","ranges":[{"events":[{"introduced":"0"},{"fixed":"1.29.7"}],"type":"ECOSYSTEM"}],"versions":["1.0.0","1.0.0-beta","1.0.0-beta2","1.1.0","1.10.0","1.10.1","1.11.0","1.12.0","1.13.0","1.14.0","1.14.1","1.15.0","1.16.0","1.17.0","1.17.1","1.18.0","1.19.0","1.2.0","1.2.1","1.20.0","1.21.0","1.22.0","1.23.0","1.24.0","1.24.1","1.25.0","1.25.1","1.25.2","1.26.0","1.27.0","1.27.1","1.28.0","1.29.0","1.29.1","1.29.2","1.29.4","1.29.5","1.29.6","1.3.0","1.3.1","1.4.0","1.4.1","1.5.0","1.5.1","1.5.2","1.6.0","1.7.0","1.8.0","1.8.1","1.8.2","1.9.0"],"fixed":["1.29.7"]},{"ecosystem":"Packagist","name":"phpoffice/phpspreadsheet","ranges":[{"events":[{"introduced":"2.0.0"},{"fixed":"2.1.6"}],"type":"ECOSYSTEM"}],"versions":["2.0.0","2.1.0","2.1.1","2.1.3","2.1.4","2.1.5"],"fixed":["2.1.6"]},{"ecosystem":"Packagist","name":"phpoffice/phpspreadsheet","ranges":[{"events":[{"introduced":"2.2.0"},{"fixed":"2.3.5"}],"type":"ECOSYSTEM"}],"versions":["2.2.0","2.2.1","2.2.2","2.3.0","2.3.2","2.3.3","2.3.4"],"fixed":["2.3.5"]},{"ecosystem":"Packagist","name":"phpoffice/phpexcel","ranges":[{"events":[{"introduced":"0"},{"last_affected":"1.8.2"}],"type":"ECOSYSTEM"}],"versions":["1.7.9","1.7.9-rc1","1.8.0","1.8.0rc1","1.8.0rc2","1.8.0rc3","1.8.0rc4","1.8.1","1.8.2"],"fixed":[]}],"references":["https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-wv23-996v-q229","https://nvd.nist.gov/vuln/detail/CVE-2024-56410","https://github.com/PHPOffice/PhpSpreadsheet/commit/45052f88e04c735d56457a8ffcdc40b2635a028e","https://github.com/PHPOffice/PhpSpreadsheet"],"sources":[{"name":"OSV","id":"GHSA-wv23-996v-q229","modified":"2025-03-06T18:37:39.563941Z","url":"https://osv.dev/vulnerability/GHSA-wv23-996v-q229"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","score":5.4},{"source":"OSV","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","score":4.8}]}