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

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-23 · updated 2026-10-30
Weakness: CWE-306

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

netboxlabs netbox-mcp-server: before 1.2.1

References

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

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