GHSA-44jg-mv3h-wj6g

Опубликовано: 15 янв. 2026

Источник: github

Github: Прошло ревью

CVSS4: 1.9

Описание

solspace/craft-freeform Vulnerable to XSS in PhpSpreadsheet HTML Writer Due to Unsanitized Styling Data

Summary

Short summary of the problem. Make the impact and severity as clear as possible. For example: An unsafe deserialization vulnerability allows any unauthenticated user to execute arbitrary code on the server.

\PhpOffice\PhpSpreadsheet\Writer\Html doesn't sanitize spreadsheet styling information such as font names, allowing an attacker to inject arbitrary JavaScript on the page.

Details

Give all details on the vulnerability. Pointing to the incriminated source code is very helpful for the maintainer.

See https://github.com/advisories/GHSA-wgmf-q9vr-vww6

PoC

Complete instructions, including specific configuration details, to reproduce the vulnerability.

Example target script:

<?php require 'vendor/autoload.php'; $reader = \PhpOffice\PhpSpreadsheet\IOFactory::createReader("Xlsx"); $spreadsheet = $reader->load(__DIR__ . '/book.xlsx'); $writer = new \PhpOffice\PhpSpreadsheet\Writer\Html($spreadsheet); print($writer->generateHTMLAll());

Save this file in the same directory:

book.xlsx

Open index.php in a web browser. An alert should be displayed.

Impact

What kind of vulnerability is it? Who is impacted?

Full takeover of the session of users viewing spreadsheet files as HTML.

Ссылки

Пакеты

Наименование

solspace/craft-freeform

composer

Затронутые версииВерсия исправления

< 4.1.23

4.1.23

1.9 Low

CVSS4

Дефекты

CWE-79

1.9 Low

CVSS4

Дефекты

CWE-79