Packages / react-router / Security

ModerateVulnerabilityGHSA-h8fp-f39c-q6mhCVE-2026-53667Published 23 Jul 2026

React Router: RSCErrorHandler Missing Protocol Validation (XSS)

Affected releases · react-router

  • 7.x7.11.0 – 7.17.0Fixed in 7.18.0

On 7.x, the newest line:

npm install react-router@7.18.0
8.x

  1. Not affected

    8.0.0 – 8.5.0

    8 releases, latest

7.x

  1. Not affected

    7.0.0 – 7.10.1

    35 releases

  2. Affected

    7.11.0 – 7.17.0

    12 releases

  3. Fixed

    7.18.0 – 7.18.4

    5 releases

228 stable releases of react-router, oldest to newest, one row per major.

Is your project affected?

Paste your package.json, or type the range you declare for react-router. It is read in your browser and sent nowhere.

What happens

This is a follow up to github.com/remix-run/react-router/security/advi…. React Router was alerted of a code path in the (unstable) RSC error handling path in which redirects from untrusted sources could still result in an XSS vector via attacker-supplied redirect targets

[!NOTE] This only affects your application if you are using the unstable RSC APIs