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CVE-2026-81098: Missing Authentication for Critical Function in team-telnyx telnyx-mcp

0
Critical
VulnerabilityCVE-2026-81098cvecve-2026-81098
Published: 08/27/2026 (08/27/2026, 14:50:38 UTC)
Source: CVE Database V5
Vendor/Project: team-telnyx
Product: telnyx-mcp

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.

CVSS v4.0

Score 9.3critical

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Vuln. Confidentiality
High
Vuln. Integrity
High
Vuln. Availability
None
Subsq. Confidentiality
None
Subsq. Integrity
None
Subsq. Availability
None
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Affected software

GitHub Actionsmore threats →cve
telnyx-mcp
pkg:github/telnyx-mcp
Affected versions
<=6.83.0

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

Technical Details

Data Version
5.2
Assigner Short Name
VulnCheck
Date Reserved
2026-08-26T16:00:33.062Z
Cvss Version
4.0
State
PUBLISHED
Remediation Level
null

Threat ID: 6a906bb2acd9273b4983a17e

Added to database: 08/27/2026, 16:54:10 UTC

Last updated: 08/28/2026, 00:59:14 UTC

Views: 8

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