#zero_day

**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...

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