Client-side XSS Vulnerability in React Router Affects React Applications
CVE-2026-33245

8HIGH

Key Information:

Vendor

Remix-run

Status
React-router
Vendor
CVE Published:
2 June 2026

What is CVE-2026-33245?

A client-side Cross-Site Scripting (XSS) vulnerability exists in React Router versions 7.7.0 through 7.13.1, specifically when utilizing unstable React Server Components (RSC) APIs. This weakness can arise during redirect handling if the redirects are sourced from untrusted origins, potentially enabling attackers to execute malicious scripts in a user's browser. Applications that do not employ the unstable RSC APIs in React Router are not affected. The issue has been resolved in version 7.13.2, which users should upgrade to in order to mitigate this vulnerability.

Affected Version(s)

react-router >= 7.7.0, < 7.13.2

References

https://github.com/remix-run/react-router/security/adviso...
x_refsource_CONFIRM

CVSS V3.1

Score:
8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.