Vulnerability · Published Oct 23, 2026 · Assigned by GitHub_M

CVE-2026-57207NetBox MCP Server: HTTP transport exposes all NetBox data without authentication

Medium 5.9

In plain English

A medium-severity missing authentication in netbox-mcp-server from netboxlabs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities).

Severity (CVSS 3.1)5.9Medium

Exploit odds (30 days)0.4%top 65.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

NetBox MCP Server is a simple read-only Model Context Protocol server for NetBox. Prior to version 1.2.1, when running with TRANSPORT=http, the MCP server has no authentication on the HTTP endpoint. Any client that can reach the port gets a valid MCP session and full access to all four NetBox tools - no token or credential needed. This issue has been patched in version 1.2.1.

Affected products (as reported)

Vendor	Product	Versions
netboxlabs	netbox-mcp-server	< 1.2.1

Weakness: CWE-306, CWE-1059 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

References

https://github.com/netboxlabs/netbox-mcp-server/security/advisories/GHSA-5qg7-j8mr-9477 x_refsource_CONFIRM
https://github.com/netboxlabs/netbox-mcp-server/releases/tag/v1.2.1 x_refsource_MISC