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 hand…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (9.9th 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.