Next.js has information disclosure in development server's Model Context Protocol endpoint
The Next.js development server (`next dev`) exposes a Model Context Protocol endpoint that does not verify which website a request originates from, allowing a malicious website visited by the developer to read sensitive development data — including the project's location on disk, source code snippets from error reports, the route inventory, and development logs. Only applications run with `next dev` are affected. Production deployments do not serve this endpoint.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-94486US | medium5.4 | — | ||
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 r… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/vercel/next.jsPACKAGE
- https://github.com/vercel/next.js/commit/2d9f50a409312696145b82b3157aadb6b1fef476WEB
- https://github.com/vercel/next.js/releases/tag/v16.3.8WEB
- https://github.com/vercel/next.js/security/advisories/GHSA-39w2-rjm5-chcvWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-94486ADVISORY
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