CVE-2019-12331 – phpoffice/phpspreadsheet

Package

Manager: composer
Name: phpoffice/phpspreadsheet
Vulnerable Version: >=0 <1.8.0

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EPSS: 0.00324 pctl0.54809

Details

XXE in PHPSpreadsheet due to incomplete fix for previous encoding issue PHPOffice PhpSpreadsheet before 1.8.0 has an XXE issue. The XmlScanner decodes the sheet1.xml from an .xlsx to utf-8 if something else than UTF-8 is declared in the header. This was a security measurement to prevent CVE-2018-19277 but the fix is not sufficient. By double-encoding the the xml payload to utf-7 it is possible to bypass the check for the string ?<!ENTITY? and thus allowing for an xml external entity processing (XXE) attack.

Metadata

Created: 2019-11-20T01:39:57Z
Modified: 2025-03-06T18:02:26Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2019/11/GHSA-vvwv-h69m-wg6f/GHSA-vvwv-h69m-wg6f.json
CWE IDs: ["CWE-611"]
Alternative ID: GHSA-vvwv-h69m-wg6f
Finding: F083
Auto approve: 1