CVE-2026-33244: medium-severity vulnerability in remix-run react-router
React Router has stored XSS via unescaped Location header in prerendered redirect HTML
Published
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.4epss 0.1%
React Router is a router for React. In versions 7.5.1 through 7.13.1, when using Framework Mode with pre-rendering enabled, improper neutralization of the HTTP `Location` header value can permit Cross-Site Scripting (XSS) in the statically generated HTML files if the redirect location comes from an untrusted source. This does not impact applications using Declarative Mode (`<BrowserRouter>`) or Data Mode (`createBrowserRouter/<RouterProvider>`). This is patched in version 7.13.2.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Affected products
remix-run · react-routerRelated CVEs — remix-run react-router
In the same product, most dangerous first.
CVE-2025-43864HIGHReact Router allows a DoS via cache poisoning by forcing SPA modeEPSS 20.5%CVE-2025-61686CRITICALReact Router has Path Traversal in File Session StorageEPSS 17.3%CVE-2025-31137HIGHRemix and React Router allow URL manipulation via Host / X-Forwarded-Host headersEPSS 1.2%CVE-2026-22029HIGHReact Router vulnerable to XSS via Open RedirectsEPSS 0.9%CVE-2025-43865HIGHReact Router allows pre-render data spoofing on React-Router framework modeEPSS 0.8%CVE-2026-55685HIGHReact Router: Unauthenticated Denial of Service via Inefficient Route MatchingEPSS 0.7%