Vulnerabilities in pkg:npm/@remix-run/server-runtime

PACKAGE
Advisory Identifier: GHSA-84g9-w2xq-vcv6
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Advisory Summary

CVE-2026-53663 is a LOW (CVSS 3.1) potential csrf vulnerability (CWE-352: Cross-Site Request Forgery (CSRF)) affecting React Router libraries in the npm ecosystem. The issue involves potential csrf via put/patch/delete document requests. Remediation is available by upgrading affected packages to version 7.15.1, 2.17.5.

3 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:npm/@remix-run/server-runtime

3 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:npm/@remix-run/server-runtime. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-84g9-w2xq-vcv6 CVE-2026-53663 LOW React Router: Potential CSRF via PUT/PATCH/DELETE document requests
GHSA-h5cw-625j-3rxh CVE-2026-22030 MODERATE React Router has CSRF issue in Action/Server Action Request Processing
GHSA-8x6r-g9mw-2r78 CVE-2026-42342 HIGH React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint

CVE-2026-53663 at a Glance

CVE Identifier CVE-2026-53663
GHSA Identifier GHSA-84g9-w2xq-vcv6
Severity LOW
CVSS v3.1 Base Score 3.1
CWE Classification CWE-352: Cross-Site Request Forgery (CSRF)
Affected Product React Router
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 3.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-53663

To remediate this vulnerability, upgrade all affected React Router dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

react-router fixed: 7.15.1 
npm install react-router@7.15.1
@remix-run/server-runtime fixed: 2.17.5 
npm install @remix-run/server-runtime@2.17.5
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls react-router

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-53663, inspect your project dependencies using npm:

npm ls react-router

Analyze the terminal output to locate any version of React Router in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 7.15.1), your application is affected.

Note: The npm ls react-router command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-352: Cross-Site Request Forgery (CSRF), where the web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor. In React Router, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Certain CSRF checks in React Router v7 [Framework Mode]() were insufficient and run on POST requests, but were bypassed on PUT/PATCH/DELETE requests. This is a low severity vulnerability because modern browser protections (CORS preflight, SameSite cookies) already block the cross-origin attack vectors that this missing CSRF check would otherwise gate. > [!NOTE] > This does not impact your React Router application if you are using [Declarative Mode](https://reactrouter.com/start/modes#framework) (`<BrowserRouter>`) or [Data Mode](https://reactrouter.com/start/modes#data) (`createBrowserRouter`/`<RouterProvider>`).

CVE-2026-53663 Affected React Router Versions

2 component(s)
Fixed Versions:
7.15.12.17.5
Product / Package Ecosystem Affected Versions Fixed Version
react-router
npm/react-router
npm
≥ 7.12.0
< 7.15.1
7.15.1
@remix-run/server-runtime
npm/@remix-run/server-runtime
npm
≥ 2.17.3
< 2.17.5
2.17.5

References

GitHub Advisory / Wiki ADVISORY
https://github.com/remix-run/react-router/security/advisories/GHSA-84g9-w2xq-vcv6
React Router Source Repository REPOSITORY
https://github.com/remix-run/react-router

Frequently Asked Questions

What is CVE-2026-53663?
CVE-2026-53663 is a security vulnerability in React Router involving Potential CSRF via PUT/PATCH/DELETE document requests under CWE-352: Cross-Site Request Forgery (CSRF).
Which React Router versions are affected?
Affected versions include releases prior to 7.15.1, 2.17.5 across affected packages: react-router, @remix-run/server-runtime.
What version fixes CVE-2026-53663?
Upgrading to 7.15.1, 2.17.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is react-router affected?
Yes, react-router is affected in releases prior to 7.15.1. Upgrade your dependency to 7.15.1 or later.
Is @remix-run/server-runtime affected?
Yes, @remix-run/server-runtime is affected in releases prior to 2.17.5. Upgrade your dependency to 2.17.5 or later.
What is the CVSS score of CVE-2026-53663?
CVE-2026-53663 has a CVSS v3.1 base score of 3.1 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2026-53663?
CVE-2026-53663 is classified under CWE-352: Cross-Site Request Forgery (CSRF) (The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.).
How can I check npm dependencies for CVE-2026-53663?
Run the dependency tree command: 'npm ls react-router'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-84g9-w2xq-vcv6",
  "modified" : "2026-06-15T20:06:15Z",
  "published" : "2026-06-15T20:06:15Z",
  "aliases" : [ "CVE-2026-53663" ],
  "summary" : "React Router: Potential CSRF via PUT/PATCH/DELETE document requests",
  "details" : "Certain CSRF checks in React Router v7 [Framework Mode]() were insufficient and run on POST requests, but were bypassed on PUT/PATCH/DELETE requests.  This is a low severity vulnerability because modern browser protections (CORS preflight, SameSite cookies) already block the cross-origin attack vectors that this missing CSRF check would otherwise gate.\n\n> [!NOTE]\n> This does not impact your React Router application if you are using [Declarative Mode](https://reactrouter.com/start/modes#framework) (`<BrowserRouter>`) or [Data Mode](https://reactrouter.com/start/modes#data) (`createBrowserRouter`/`<RouterProvider>`).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "react-router"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "7.12.0"
      }, {
        "fixed" : "7.15.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@remix-run/server-runtime"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.17.3"
      }, {
        "fixed" : "2.17.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/remix-run/react-router/security/advisories/GHSA-84g9-w2xq-vcv6"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/remix-run/react-router"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-352" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-15T20:06:15Z",
    "nvd_published_at" : null
  }
}