CVE-2024-55878: Shuchkin Simplexlsx

Medium severity, CVSS 6.8. EPSS: 0.5% chance of exploitation in the next 30 days.

SimpleXLSX is software for parsing and retrieving data from Excel XLSx files. Starting in version 1.0.12 and prior to version 1.1.12, when calling the extended toHTMLEx method, it is possible to execute arbitrary JavaScript code. Version 1.1.12 fixes the issue. As a workaround, don't use direct publication via toHTMLEx.

Affected products

• Shuchkin Simplexlsx: from 1.0.12, before 1.1.12 (fixed in 1.1.12)

Published 2024-12-12. Last modified 2026-06-17.