Next.js is a React framework for building full-stack web applications.
CVE-2026-94486
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.
Assessment
- CVSS
- 2.3 (v4.0)
- Severity
- Low
- EPSS
- 0.11% chance of exploitation in the next 30 days
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 2 October 2026
- Last updated
- 7 October 2026
- Weakness
- CWE-346
- Assigner
- security-advisories@github.com
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
At the source
References
- https://github.com/vercel/next.js/commit/2d9f50a409312696145b82b3157aadb6b1fef476
- https://github.com/vercel/next.js/releases/tag/v16.3.8
- https://github.com/vercel/next.js/security/advisories/GHSA-39w2-rjm5-chcv
- https://nvd.nist.gov/vuln/detail/CVE-2026-94486
- https://github.com/advisories/GHSA-39w2-rjm5-chcv
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