---
id: CVE-2026-94485
title: Next.js is a React framework for building full-stack web applications
summary: >-
  Next.js is a React framework for building full-stack web applications. From
  16.0.0 until 16.3.8, the `next dev` development server exposes a Model Context
  Protocol endpoint without reliably restricting cross-site requests. A
  malicious we…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-346
vendor: vercel
product: next.js
affected:
  - 'next.js >= 16.0.0, < 16.3.8'
published: '2026-10-02'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T17:55:42.580'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-94485'
references:
  - url: >-
      https://github.com/vercel/next.js/commit/2d9f50a409312696145b82b3157aadb6b1fef476
    label: security-advisories@github.com
  - url: 'https://github.com/vercel/next.js/releases/tag/v16.3.8'
    label: security-advisories@github.com
  - url: 'https://github.com/vercel/next.js/security/advisories/GHSA-f87g-xv8r-7p7x'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-02T16:04:38.452430Z'
cvssSource: cna
ingestedAt: '2026-10-02T16:22:59.537Z'
---

## Overview

Next.js is a React framework for building full-stack web applications. From 16.0.0 until 16.3.8, the `next dev` development server exposes a Model Context Protocol endpoint without reliably restricting cross-site requests. A malicious website visited by a developer can reach the endpoint and read the project's disk location, source code snippets from error reports, route inventory, and development logs. Production deployments do not serve this endpoint. This issue is fixed in version 16.3.8.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.