CVE-2024-56412: 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 are vulnerable to bypass of the cross-site scripting sanitizer using the javascript protocol and special characters. An attacker can use special characters, so that the library processes the javascript protocol with special characters and generates an HTML link. 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 3.0.0, before 3.7.0 (fixed in 3.7.0)

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