{"id":"GHSA-jmpx-686v-c3wx","aliases":["CVE-2024-56365"],"title":"PhpSpreadsheet allows unauthorized Reflected XSS in the constructor of the Downloader class","titleSource":"OSV","descriptionSource":"OSV","declaredSeverity":"HIGH","description":"# Unauthorized Reflected XSS in the constructor of the `Downloader` class\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**: 8.2 (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N)\n**CVSS vector v.4.0**: 8.3 (AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:L/SI:H/SA:L)\n**Description**: using the `/vendor/phpoffice/phpspreadsheet/samples/download.php` script, an attacker can perform a XSS-type attack\n**Impact**: execution of arbitrary JavaScript code in the browser\n**Vulnerable component**: the constructor of the `Downloader` class\n**Exploitation conditions**: an unauthorized user\n**Mitigation**: sanitization of the `name` and `type` variables\n**Researcher**: Aleksey Solovev (Positive Technologies)\n\n# Research\n\nThe researcher discovered zero-day vulnerability Unauthorized Reflected Cross-Site Scripting (XSS) (in the constructor of the `Downloader` class) in Phpspreadsheet.\n\nThe latest version (3.6.0) of the `phpoffice/phpspreadsheet` library was installed. The installation was carried out with the inclusion of examples.\n\n*Listing 1. Installing the `phpoffice/phpspreadsheet` library*\n```\n$ composer require phpoffice/phpspreadsheet --prefer-source\n```\n\nThe `./vendor/phpoffice/phpspreadsheet/samples/download.php` file processes the GET parameters `name` and `type`.\n\n![fig1](https://github.com/user-attachments/assets/78d5b3c7-e2ab-4487-98e2-a975f74a71c0)\n\n*Figure 1. The `./vendor/phpoffice/phpspreadsheet/samples/download.php` file accepts GET parameters.*\n\nConsider the constructor of the `Downloader` class, where GET parameters are passed. Error is displayed without sanitization using GET parameters transmitted from the user.\n\n![fig2](https://github.com/user-attachments/assets/00baf1f8-298c-4654-a3e4-b99cf8053eac)\n\n*Figure 2. Error is displayed without sanitization*\n\nWhen clicking on the following link, arbitrary JavaScript code will be executed.\n\n*Listing 2.*\n```\nhttps://192.***.***.***/vendor/phpoffice/phpspreadsheet/samples/download.php?name=%3Cimg%20src=1%20onerror=alert()%3E&type=1\n```\n\nDemonstration of the execution of arbitrary JavaScript code.\n\n<img width=\"537\" alt=\"fig3\" src=\"https://github.com/user-attachments/assets/745d6e21-396f-4357-8ff8-e856adf15fee\" />\n\n*Figure 3. Executing arbitrary JavaScript code*\n\n\n# Credit\nThis vulnerability was discovered by **Aleksey Solovev (Positive Technologies)**","severity":"high","score":7.1,"published":"2025-01-03T17:06:05.000Z","modified":"2025-03-06T18:36:36.600Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"phpoffice/phpspreadsheet","sources":[{"name":"OSV · GHSA-jmpx-686v-c3wx","url":"https://osv.dev/vulnerability/GHSA-jmpx-686v-c3wx"}],"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","sources":[{"name":"OSV · GHSA-jmpx-686v-c3wx","url":"https://osv.dev/vulnerability/GHSA-jmpx-686v-c3wx"}],"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","sources":[{"name":"OSV · GHSA-jmpx-686v-c3wx","url":"https://osv.dev/vulnerability/GHSA-jmpx-686v-c3wx"}],"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","sources":[{"name":"OSV · GHSA-jmpx-686v-c3wx","url":"https://osv.dev/vulnerability/GHSA-jmpx-686v-c3wx"}],"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","sources":[{"name":"OSV · GHSA-jmpx-686v-c3wx","url":"https://osv.dev/vulnerability/GHSA-jmpx-686v-c3wx"}],"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":[]}],"sourceAffected":[],"references":["https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-jmpx-686v-c3wx","https://nvd.nist.gov/vuln/detail/CVE-2024-56365","https://github.com/PHPOffice/PhpSpreadsheet/commit/700a80346be269af668914172bc6f4521982d0b4#diff-fbb0f53a5c68eeeffaa9ab35552c0b01740396f1a4045af5d2935ec2a62a7816","https://github.com/PHPOffice/PhpSpreadsheet"],"sources":[{"name":"OSV","id":"GHSA-jmpx-686v-c3wx","modified":"2025-03-06T18:36:36.600886Z","url":"https://osv.dev/vulnerability/GHSA-jmpx-686v-c3wx"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N","score":7.1},{"source":"OSV","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:L/SI:H/SA:L","score":8.3}],"products":[],"remediation":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T18:15:34.797Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}