CVE-2024-56408: Phpoffice Phpspreadsheet

Medium severity, CVSS 5.4. EPSS: 0.4% chance of exploitation in the next 30 days.

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 (fixed in 1.29.7); from 2.0.0, before 2.1.6 (fixed in 2.1.6); from 2.2.0, before 2.3.5 (fixed in 2.3.5); from 3.3.0, before 3.7.0 (fixed in 3.7.0)

Published 2025-01-03. Last modified 2026-06-17.