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Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')


Severity Medium
Score 5.4/10


Hydrogen is a React-based framework for building dynamic, Shopify-powered custom storefronts. There is a potential Cross-Site Scripting (XSS) vulnerability where an arbitrary user is able to execute scripts on pages that are built with Hydrogen. This affects all 0.0.0-unstable versions and version 0.10.0-experimental.0 through 0.18.0 of Hydrogen. This vulnerability is exploitable in applications whose hydrating data is user controlled. All Hydrogen users should upgrade their project to version 0.19.0. There is no current workaround, and users should update as soon as possible. Additionally, the Content Security Policy is not an effective mitigation for this vulnerability.

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CWE-79 - Cross Site Scripting

Cross-Site Scripting, commonly referred to as XSS, is the most dominant class of vulnerabilities. It allows an attacker to inject malicious code into a pregnable web application and victimize its users. The exploitation of such a weakness can cause severe issues such as account takeover, and sensitive data exfiltration. Because of the prevalence of XSS vulnerabilities and their high rate of exploitation, it has remained in the OWASP top 10 vulnerabilities for years.

Advisory Timeline

  • Published