CVE-2026-94486
Description
A flaw was found in Next.js. The local development server exposes a Model Context Protocol (MCP) endpoint without properly restricting cross-site requests. If a developer running the development server visits a malicious website, an attacker can issue unauthorized requests to this endpoint, leading to sensitive information disclosure. This flaw allows unauthorized access to local project file locations, source code snippets from error reports, application route inventories, and development logs.
Statement
This vulnerability is rated as having Moderate impact because it exclusively targets local development environments and necessitates user interaction with an untrusted web page. Production builds and deployed production servers do not activate the Model Context Protocol endpoint, isolating exposure to active developer workstations. Furthermore, the vulnerability is limited to reading application metadata and contextual diagnostics without enabling code execution or system modification.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4.3 | 5.4 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | Required | Required | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | Low | Low | N/A |
| Integrity Impact | None | Low | N/A |
| Availability Impact | None | None | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
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