{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "phpoffice/phpspreadsheet"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.7.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.29.6"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "phpoffice/phpspreadsheet"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.29.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.1.5"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "phpoffice/phpspreadsheet"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "2.1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.3.4"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "phpoffice/phpspreadsheet"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.2.0"
            },
            {
              "fixed": "2.3.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-56411"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-01-03T17:28:50Z",
    "nvd_published_at": "2025-01-03T18:15:16Z",
    "severity": "MODERATE"
  },
  "details": "# Cross-Site Scripting (XSS) vulnerability of the hyperlink base in the HTML page header\n\n**Product**: Phpspreadsheet\n**Version**: version 3.6.0\n**CWE-ID**: CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)\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 formed without sanitizing the hyperlink base\n**Impact**: executing arbitrary JavaScript code in the browser\n**Vulnerable component**: class `PhpOffice\\PhpSpreadsheet\\Writer\\Html`, method `generateHTMLHeader`\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 of the hyperlink base in the HTML page header 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 8. Source code on the server*\n\n```\n\u003c?php\n\nrequire __DIR__ . \u0027/vendor/autoload.php\u0027;\n\n$inputFileName = \u0027./doc/Book1.xlsx\u0027;\n$spreadsheet = \\PhpOffice\\PhpSpreadsheet\\IOFactory::load($inputFileName);\n$writer = new \\PhpOffice\\PhpSpreadsheet\\Writer\\Html($spreadsheet);\nprint($writer-\u003egenerateHTMLAll());\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 HyperlinkBase in the file is inserted into the `docProps/app.xml` file.\n\n![fig14](https://github.com/user-attachments/assets/f68ef7fc-e78e-4424-8753-4318b6ff51c3)\n\n*Figure 14. Embedding the payload* \n\nAfter the changes were made, a new archive with the xlsx extension was created. At the moment of converting the xlsx file into the HTML representation, a property is obtained that participates in the formation of a string without sanitization.\n\n![fig15](https://github.com/user-attachments/assets/0aa7398c-ddd9-4c5a-ab04-41af0236dcba)\n\n*Figure 15. Generating the HTML page header using the HyperlinkBase property* \n\nAfter generating and displaying the HTML representation of the XLSX file, arbitrary JavaScript code will be executed.\n\u003cimg width=\"356\" alt=\"fig16\" src=\"https://github.com/user-attachments/assets/c3694661-31e3-4be8-9a86-6eb4dd4647b5\" /\u003e\n\n*Figure 16. Executing arbitrary JavaScript code* \n\n# Credit\nThis vulnerability was discovered by **Aleksey Solovev (Positive Technologies)**",
  "id": "GHSA-hwcp-2h35-p66w",
  "modified": "2025-01-03T19:24:56Z",
  "published": "2025-01-03T17:28:50Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-hwcp-2h35-p66w"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-56411"
    },
    {
      "type": "WEB",
      "url": "https://github.com/PHPOffice/PhpSpreadsheet/commit/45052f88e04c735d56457a8ffcdc40b2635a028e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/PHPOffice/PhpSpreadsheet"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "PhpSpreadsheet has a Cross-Site Scripting (XSS) vulnerability of the hyperlink base in the HTML page header"
}