PhpSpreadsheet allows unauthorized Reflected XSS in Currency.php file
Date: 2025-01
Affected: composer/phpoffice/phpexcel, composer/phpoffice/phpspreadsheet, composer/phpoffice/phpspreadsheet
Attack vector: xss
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2024-56366
CVE-2024-56408
CVE-2024-56409
CWE: CWE-79
CVSS: 7.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N)

# Unauthorized Reflected XSS in `Currency.php` file **Product**: Phpspreadsheet **Version**: version 3.6.0 **CWE-ID**: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') **CVSS vector v.3.1**: 8.2 (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N) **CVSS vector v.4.0**: 8.3 (AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:L/SI:H/SA:L) **Description**: using the `/vendor/phpoffice/phpspreadsheet/samples/Wizards/NumberFormat/Currency.php` script, an attacker can perform XSS-type attack **Impact**: executing arbitrary JavaScript code in the browser **Vulnerable component**: the `/vendor/phpoffice/phpspreadsheet/samples/Wizards/NumberFormat/Currency.php` file **Exploitation conditions**: an unauthorized user **Mitigation**: sanitization of the `currency` variable **Researcher**: Aleksey Solovev (Positive Technologies) # Research The researcher discovered zero-day vulnerability Unauthorized Reflected Cross-Site Scripting (XSS) (in `Currency.php` file) in Phpspreadsheet. There is no sanitization in the `/vendor/phpoffice/phpspreadsheet/samples/Wizards/NumberFormat/Currency.php` file, which leads to the possibility of a XSS attack. Strings are formed using the `currency` parameter without sanitization, controlled by an attacker. ![fig9](https://github.com/user-attachments/assets/dfac3fbf-de42-42af-8163-b76f0c54da6c) *Figure 9. A fragment of the query in which a string and a parameter are formed without sanitization* An attacker can prepare a special H


Mitigations:

Architectural layers (MAESTRO):