EUVD-2026-213336

fkie_cve-2025-23210

phpoffice/phpspreadsheet is a pure PHP library for reading and writing spreadsheet files. Affected versions have been found to have a Bypass of the Cross-site Scripting (XSS) sanitizer using the javascript protocol and special characters. This issue has been addressed in versions 3.9.0, 2.3.7, 2.1.8, and 1.29.9. Users are advised to upgrade. There are no known workarounds for this vulnerability.

GHSA-r57h-547h-w24f — PhpSpreadsheet allows bypassing of XSS sanitizer using the javascript protocol and special characters

Affected: Packagist: phpoffice/phpspreadsheet, Packagist: phpoffice/phpexcel

**Product:** PhpSpreadsheet **Version:** 3.8.0 **CWE-ID:** CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') **CVSS vector v.3.1:** 5.4 (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N) **CVSS vector v.4.0:** 4.8 (AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N) **Description:** an attacker can use special characters, so that the library processes the javascript protocol with special characters and generates an HTML link **Impact:** executing arbitrary JavaScript code in the browser **Vulnerable component:** class `PhpOffice\PhpSpreadsheet\Writer\Html`, method `generateRow` **Exploitation conditions:** a user viewing a specially generated xml file **Mitigation:** additional sanitization of special characters in a string **Researcher: Igor Sak-Sakovskiy (Positive Technologies)**

# Research

The researcher discovered zero-day vulnerability Bypass XSS sanitizer using the javascript protocol and special characters in Phpspreadsheet. The following code is written on the server, which translates the XML file into an HTML representation and displays it in the response.

*Listing 4. Source code on the server*

``` <?php

require __DIR__ . '/vendor/autoload.php';

$inputFileType = 'Xml'; $reader = \PhpOffice\PhpSpreadsheet\IOFactory::createReader($inputFileType);

$inputFileName = './doc/file.xml'; $spreadsheet = $reader->load($inputFileName); $writer = new \PhpOffice\PhpSpreadsheet\Writer\Html($spreadsheet); print($writer->generateHTMLAll…

Most recent entries from all

bdu:2025-13241

EUVD-2026-213336

fkie_cve-2025-23210

GHSA-r57h-547h-w24f — PhpSpreadsheet allows bypassing of XSS sanitizer using the javascript protocol and special characters