---
id: GHSA-qwww-vcr4-c8h2
title: 'React Router: RSC Mode CSRF Bypass Allows Action Execution Before 400 Response'
summary: 'React Router: RSC Mode CSRF Bypass Allows Action Execution Before 400 Response'
severity: high
cwe:
  - CWE-352
vendor: react-router
product: react-router
ecosystem: npm
affected:
  - 'react-router >= 7.12.0, < 8.3.0'
patched:
  - react-router 8.3.0
published: '2026-07-24'
updated: '2026-07-24'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-qwww-vcr4-c8h2'
references:
  - url: >-
      https://github.com/remix-run/react-router/security/advisories/GHSA-qwww-vcr4-c8h2
  - url: >-
      https://github.com/remix-run/react-router/commit/7a71c728ad116bd78699a258b2014ce9585729f5
  - url: 'https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v830'
  - url: 'https://github.com/remix-run/react-router/releases/tag/react-router@8.3.0'
  - url: 'http://github.com/remix-run/react-router/pull/15311'
  - url: 'https://github.com/advisories/GHSA-qwww-vcr4-c8h2'
tags:
  - ghsa
  - npm
ingestedAt: '2026-07-24T17:34:27.676Z'
---

## Overview

This is a follow up to CVE-2026-22030 to address related CSRF flows in unstable RSC code paths.

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

## Affected packages

- `react-router >= 7.12.0, < 8.3.0`

## Remediation

Upgrade to a patched release:

- `react-router 8.3.0`