Description
The Telnyx MCP server exposed its HTTP transport on every interface and did not require a caller credential. packages/mcp-server/src/http.ts served MCP on the root path with a listener bound to all interfaces and parsed the caller's authentication headers in a mode that did not fail when they were absent, so a request without any credential completed initialisation and dispatched tools. Dispatch forwarded the server's own stored credentials, the Telnyx API key and client secret together with the code-execution key, to the upstream endpoint, so an unauthenticated caller able to reach the port acted with them. The current code defaults the host to loopback, requires a server API key, and enforces it in middleware.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
team-telnyx telnyx-mcp
Default version status: unaffected
0 to ≤ 6.83.0affected
pkg:npm/telnyx-mcpReferences
- https://github.com/team-telnyx/telnyx-node ↗
- https://github.com/team-telnyx/telnyx-node/pull/450 ↗
- https://github.com/team-telnyx/telnyx-node/security/advisories/GHSA-46jp-xr2h-fw7h ↗
- https://www.vulncheck.com/advisories/telnyx-mcp-server-through-6.83.0-missing-authentication-on-streamable-http-transport ↗