What’s Vulnerable › Vulnerabilities

CVE-2024-56408: PhpSpreadsheet allows unauthorized reflected XSS in `Convert-Online.php` file

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-01-03 · updated 2026-06-17
• Weakness: CWE-79

Description

PhpSpreadsheet is a PHP library for reading and writing spreadsheet files. Versions prior to 3.7.0, 2.3.5, 2.1.6, and 1.29.7 have no sanitization in the `/vendor/phpoffice/phpspreadsheet/samples/Engineering/Convert-Online.php` file, which leads to the possibility of a cross-site scripting attack. Versions 3.7.0, 2.3.5, 2.1.6, and 1.29.7 contain a patch for the issue.

Affected products

• PHPOffice PhpSpreadsheet: before 1.29.7; from 2.0.0 before 2.1.6; from 2.2.0 before 2.3.5; from 3.3.0 before 3.7.0 — fixed in 1.29.7, 2.1.6, 2.3.5, 3.7.0

How to fix

Upgrade to a fixed version: PHPOffice PhpSpreadsheet 1.29.7, 2.1.6, 2.3.5, 3.7.0. Check the vendor advisory for mitigations.

References

• https://github.com/PHPOffice/PhpSpreadsheet/commit/700a80346be269af668914172bc6f4521982d0b4
• https://github.com/PHPOffice/PhpSpreadsheet/commit/9b9a55c7154daa7cd4095f618933c240508ba3c1
• https://github.com/PHPOffice/PhpSpreadsheet/commit/a50ebfe118b3ae0ddaea1c48ac19dc38692f4abc
• https://github.com/PHPOffice/PhpSpreadsheet/commit/b8fac55aa5cb7a3d514c7308378bb37bb711b25e
• https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-x88g-h956-m5xg
• https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-x88g-h956-m5xg

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