CVE-2026-94486Network attack vectorHinoki check available

Development data disclosure via unchecked MCP request origin

Published Oct 2, 2026 · Updated Oct 2, 2026

Information disclosure in Vercel Next.js 16.0.0 through 16.3.7 allows remote attackers to read development data through the next dev MCP endpoint. The endpoint fails to verify the requesting website's origin and exposes project paths, route inventory, development logs, and source snippets from error reports. Exploitation requires a developer to visit a malicious website while next dev is running; production deployments do not serve the endpoint.

CVSS severity2.3
Low
EPSS probability0.11%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Information disclosure in Vercel Next.js 16.0.0 through 16.3.7 allows remote attackers to read development data through the next dev MCP endpoint. The endpoint fails to verify the requesting website's origin and exposes project paths, route inventory, development logs, and source snippets from error reports. Exploitation requires a developer to visit a malicious website while next dev is running; production deployments do not serve the endpoint.

The record

CVE
CVE-2026-94486
Published
Oct 2, 2026
Updated
Oct 2, 2026
Vendor
Vercel
Product
Next.js
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 16.0.0, < 16.3.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vercel · Next.jsversion=>= 16.0.0, < 16.3.8

Published CVSS scores

2.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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