{"id":"CVE-2024-56408","aliases":["GHSA-x88g-h956-m5xg"],"url":"https://o3.security/vulnerability/CVE-2024-56408","summary":"PhpSpreadsheet allows unauthorized reflected XSS in `Convert-Online.php` file","details":"# Unauthorized Reflected XSS in `Convert-Online.php` file\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/Engineering/Convert-Online.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/Engineering/Convert-Online.php` file\n**Exploitation conditions**: an unauthorized user\n**Mitigation**: sanitization of the quantity variable\n**Researcher**: Aleksey Solovev (Positive Technologies)\n\n# Research\n\nThe researcher discovered zero-day vulnerability Unauthorized Reflected Cross-Site Scripting (XSS) (in `Convert-Online.php` file) in Phpspreadsheet.\n\nThere is no sanitization in the `/vendor/phpoffice/phpspreadsheet/samples/Engineering/Convert-Online.php` file, which leads to the possibility of a XSS attack.\n\n\n\n*Figure 4. The message with the quantity parameter is displayed without sanitization*\n\n\nThe following figure shows a POST HTTP-request and a response to the server with the variable quantity, which is displayed in the response from the server without sanitization.\n\n![\"fig5\"](\"https://github.com/user-attachments/assets/022323c9-ca1e-44ea-9380-37ed7848e971\")
\n\n*Figure 5. In the server's response , the quantity variable is displayed without sanitization*\n\nAn attacker can prepare a special HTML form that will be automatically sent to the vulnerable scenario.\n\n*Listing 3. HTML form that demonstrates the exploitation of the XSS vulnerability*\n\n```\n\n \n \n \n \n \n\n```\n\nAfter the user visits the attacker's resource, the form will be sent to the vulnerable scenario, which will lead to the execution of arbitrary code in the client's browser.\n \n![\"fig6\"](\"https://github.com/user-attachments/assets/e52b68c6-5a98-4db2-85ec-5bf37e4cb625\")
\n\n*Figure 6. Executing arbitrary JavaScript code*\n\n\n# Credit\nThis vulnerability was discovered by **Aleksey Solovev (Positive Technologies)**","published":"2025-01-03T16:05:22.944Z","modified":"2026-08-12T03:51:20.223545655Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"phpoffice/phpspreadsheet","fixedVersion":"3.7.0"},{"ecosystem":"Packagist","name":"phpoffice/phpspreadsheet","fixedVersion":"1.29.7"},{"ecosystem":"Packagist","name":"phpoffice/phpspreadsheet","fixedVersion":"2.1.6"},{"ecosystem":"Packagist","name":"phpoffice/phpspreadsheet","fixedVersion":"2.3.5"},{"ecosystem":"Packagist","name":"phpoffice/phpexcel","fixedVersion":null}],"fix":{"url":"https://github.com/PHPOffice/PhpSpreadsheet/commit/700a80346be269af668914172bc6f4521982d0b4","label":"PHPOffice/PhpSpreadsheet@700a803"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56408.json"},{"type":"ADVISORY","url":"https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-x88g-h956-m5xg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-56408"},{"type":"FIX","url":"https://github.com/PHPOffice/PhpSpreadsheet/commit/700a80346be269af668914172bc6f4521982d0b4"},{"type":"FIX","url":"https://github.com/PHPOffice/PhpSpreadsheet/commit/9b9a55c7154daa7cd4095f618933c240508ba3c1"},{"type":"FIX","url":"https://github.com/PHPOffice/PhpSpreadsheet/commit/a50ebfe118b3ae0ddaea1c48ac19dc38692f4abc"},{"type":"FIX","url":"https://github.com/PHPOffice/PhpSpreadsheet/commit/b8fac55aa5cb7a3d514c7308378bb37bb711b25e"},{"type":"PACKAGE","url":"https://github.com/PHPOffice/PhpSpreadsheet"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:20.223545655Z"}}