CVE-2024-56364: Cross-site Scripting vulnerability in SimpleXLSXEx::readThemeColors, SimpleXLSXEx::getColorValue and SimpleXLSX::toHTMLEx

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: none known
Published: 2024-12-23 · updated 2026-06-17
Weakness: CWE-79

Description

SimpleXLSX is software for parsing and retrieving data from Excel XLSx files. Starting in 1.0.12 and ending in 1.1.13, when calling the extended toHTMLEx method, it is possible to execute arbitrary JavaScript code. This vulnerability is fixed in 1.1.13.

Affected products

shuchkin simplexlsx: from 1.0.12, < 1.1.13

References

https://github.com/shuchkin/simplexlsx/commit/71a5e3d40d14e33161f8a40b3fd02de542218ef0
https://github.com/shuchkin/simplexlsx/security/advisories/GHSA-r87q-fj25-f8jf

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