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Medium

React Router has stored XSS via unescaped Location header in prerendered redirect HTML

  • Disclosed: 03.06.2026
  • Updated: 11.10.2026 10:22

When using React Router v7 Framework Mode with Pre-rendering enabled, an improper neutralization of the HTTP Location header value can permit Cross-Site Scripting (XSS) in statically generated HTML files if the redirect location comes from an untrusted source.

[!NOTE] This does not impact your React Router application if you are using Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>).

Affected software

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PlatformPackageVulnerable versionsFixed in
npm package react-router >= 7.5.1, < 7.13.2 7.13.2

References

CVSS score 5.4/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE)
CWE-79
Platform
npm
Package
react-router
Disclosed
03.06.2026
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-f22v-gfqf-p8f3 - CC BY 4.0

Vulnerability history: react-router

All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (20) in the archive
Total entries
20
First → latest
04.2025 07.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • High 11
  • Medium 8
  • Low 1

Disclosures per year

Severity:
  1. React Router: RSC Mode CSRF Bypass Allows Action Execution Before 400 Response
    High ghsa-qwww-vcr4-c8h2 >= 7.12.0, < 7.18.2, >= 8.0.0, < 8.3.0 7.18.2, 8.3.0
  2. React Router: Unauthenticated Denial of Service via Inefficient Route Matching
    High CVE-2026-55685 >= 7.0.0, < 7.18.0 7.18.0
  3. React Router vulnerable to Denial of Service via reflected user input in single-fetch
    High · 7.5 CVE-2026-34077 >= 7.0.0, < 7.14.0 7.14.0
  4. React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint
    High · 7.5 CVE-2026-42342 >= 7.0.0, < 7.15.0 7.15.0
  5. React Router's vendored turbo-stream v2 allows arbitrary constructor invocation via TYPE_ERROR deserialization leading to Unauth RCE
    High · 8.1 CVE-2026-42211 >= 7.0.0, < 7.14.2 7.14.2
  6. React Router vulnerable to XSS in unstable RSC redirect handling via javascript: redirect targets
    High · 8.0 CVE-2026-33245 >= 7.7.0, < 7.13.2 7.13.2
  7. React Router has stored XSS via unescaped Location header in prerendered redirect HTML this entry
    Medium · 5.4 CVE-2026-33244 >= 7.5.1, < 7.13.2 7.13.2
  8. React Router vulnerable to XSS via Open Redirects
    High · 8.0 CVE-2026-22029 >= 7.0.0, < 7.12.0 7.12.0
  9. React Router SSR XSS in ScrollRestoration
    High · 8.2 CVE-2026-21884 >= 7.0.0, < 7.12.0 7.12.0
  10. React Router has XSS Vulnerability
    High · 7.6 CVE-2025-59057 >= 7.0.0, < 7.9.0 7.9.0
  11. React Router allows pre-render data spoofing on React-Router framework mode
    High · 8.2 CVE-2025-43865 >= 7.0.0-pre.0, < 7.5.2 7.5.2
  12. React Router allows a DoS via cache poisoning by forcing SPA mode
    High · 7.5 CVE-2025-43864 >= 7.2.0, < 7.5.2 7.5.2

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