What is CVE-2026-33245?

CVE-2026-33245 is a high-severity vulnerability in Remix-Run React-Router, classified under Cross-site Scripting. CVSS score: 8.0/10. Published 2026-06-02.

How severe is CVE-2026-33245?

High severity. CVSS v3 base score is 8.0 out of 10.

XSS in Remix-Run React-Router

CVE-2026-33245

React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS) vulnerability in the RSC redirect handling if redirects come from untrusted sources. This does not impact applications that are not using the unstable RSC APIs in React Router. This is patched in version 7.13.2.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (8.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N.

Affected products

Remix-run React-router — versions >= 7.7.0, < 7.13.2
Shopify React-router

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33245?: CVE-2026-33245 is a high-severity vulnerability in Remix-Run React-Router, classified under Cross-site Scripting. CVSS score: 8.0/10. Published 2026-06-02.
How severe is CVE-2026-33245?: High severity. CVSS v3 base score is 8.0 out of 10.