CVE-2026-94485
Medium
Description
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.
SeverityMedium
CVSS5.3
Exploit probability—
Product
Vercel Next.js
PublishedOct 2, 2026
First seenOct 2, 2026
Weakness typeCWE-346CWE-346
How to fix
Update
- vercel next.js16.3.8 or later
- next16.3.8 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| vercel next.js | 16.0.0 ≤ v < 16.3.8 | 16.3.8 |
| nextnpm | 16.0.0 ≤ v < 16.3.8 | 16.3.8 |
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