Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2026-21884
Summary
A XSS vulnerability exists in in React Router's "<ScrollRestoration>" API in Framework Mode when using the "getKey/storageKey" props during Server-Side Rendering which could allow arbitrary JavaScript execution during SSR if untrusted content is used to generate the keys. Note: This does not impact applications if developers have disabled server-side rendering in Framework Mode, or if they are using Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>). Issue has been fixed in @remix-run/react 2.17.3 and react-router 7.12.0.
- LOW
- NETWORK
- LOW
- CHANGED
- REQUIRED
- NONE
- HIGH
- NONE
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.
References
Advisory Timeline
- Published
