CVE-2024-56410: PhpSpreadsheet has Cross-Site Scripting (XSS) vulnerability in custom properties

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% 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 a cross-site scripting (XSS) vulnerability in custom properties. The HTML page is generated without clearing custom properties. 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

Get alerted when CVE-2024-56410 or the next vulnerability affects your stack