{"id":"CVE-2026-81098","summary":"Telnyx MCP Server through 6.83.0 Missing Authentication on Streamable HTTP Transport","details":"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.","aliases":["GHSA-46jp-xr2h-fw7h"],"modified":"2026-08-28T11:30:23.094021911Z","published":"2026-08-27T14:50:38.327Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-306"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81098.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81098.json"},{"type":"ADVISORY","url":"https://github.com/team-telnyx/telnyx-node/security/advisories/GHSA-46jp-xr2h-fw7h"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81098"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/telnyx-mcp-server-through-6.83.0-missing-authentication-on-streamable-http-transport"},{"type":"REPORT","url":"https://github.com/team-telnyx/telnyx-node/pull/450"},{"type":"PACKAGE","url":"https://github.com/team-telnyx/telnyx-node"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/team-telnyx/telnyx-node","events":[{"introduced":"0"},{"last_affected":"96b9fb736e2e4a9871f0aa97c8bbffac9f01fb61"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"6.83.0"}],"source":"AFFECTED_FIELD"}}],"versions":["v3.0.0","v6.83.0","v6.74.2","v6.74.1","v6.74.0","v6.73.2","v6.73.1","v6.73.0","v6.72.0","v6.71.0","v6.70.0","v6.69.0","v6.68.0","v6.67.0","v6.66.2","v6.66.1","v6.66.0","v6.65.0","v6.64.0","v6.63.0","v6.62.0","v6.61.0","v6.60.0","v6.59.0","v6.58.0","v6.57.0","v6.56.0","v6.55.1","v6.55.0","v6.54.0","v6.53.0","v6.52.0","v6.51.0","v6.50.0","v6.49.0","v6.48.0","v6.47.0","v6.46.0","v6.45.0","v6.44.0","v6.43.0","v6.42.0","v6.41.1","v6.41.0","v6.40.0","v6.39.0","v6.38.0","v6.37.0","v6.36.0","v6.35.0","v6.34.0","v6.33.0","v6.32.0","v6.31.0","v6.30.0","v6.29.7","v6.29.6","v6.29.5","v6.29.4","v6.29.3","v6.29.2","v6.29.1","v6.29.0","v6.28.0","v6.27.0","v6.26.0","v6.25.0","v6.24.0","v6.23.0","v6.22.1","v6.22.0","v6.21.0","v6.20.0","v6.19.0","v6.18.0","v6.17.0","v6.16.0","v6.15.0","v6.14.0","v6.13.0","v6.12.0","v6.11.0","v6.10.2","v6.10.1","v6.10.0","v6.9.0","v6.8.2","v6.8.1","v6.8.0","v6.7.1","v6.7.0","v6.6.1","v6.6.0","v6.5.0","v6.4.1","v6.4.0","v6.3.0","v6.2.0","v6.1.0","v6.0.0","v5.55.0","v5.54.0","v5.53.0","v5.52.0","v5.51.1","v5.51.0","v5.50.0","v5.49.0","v5.48.0","v5.47.1","v5.47.0","v5.46.0","v5.45.0","v5.44.0","v5.43.0","v5.42.0","v5.41.0","v5.40.0","v5.39.0","v5.38.0","v5.37.1","v5.37.0","v5.36.0","v5.35.0","v5.34.0","v5.33.0","v5.32.0","v5.31.0","v5.30.0","v5.29.0","v5.28.0","v5.27.0","v5.26.0","v5.25.1","v5.25.0","v5.24.0","v5.23.0","v5.22.0","v5.21.0","v5.20.0","v5.19.1","v5.19.0","v5.18.0","v5.17.2","v5.17.1","v5.17.0","v5.16.1","v5.16.0","v5.15.0","v5.14.0","v5.13.1","v5.13.0","v5.12.0","v5.11.0","v5.10.0","v5.9.0","v5.8.0","v5.7.1","v5.7.0","v5.6.0","v5.5.0","v5.4.0","v5.3.0","v5.2.2","v5.2.1","v5.2.0","v5.1.0","v5.0.0","v4.6.0","v4.5.1","v4.5.0","v4.4.0","v4.3.0","v4.2.1","v4.2.0","v4.1.0","v4.0.2","v4.0.1","v4.0.0","v3.9.2","v3.9.1","v3.9.0","v3.8.0","v3.7.0","v3.6.0","v3.5.0","v3.4.2","v3.4.1","v3.4.0","v3.3.3","v3.3.2","v3.3.1","v3.3.0","v3.2.0","v3.1.0","v3.0.0-alpha","v2.0.0","v1.27.0","v1.26.2","v1.26.1","v1.26.0","1.25.5","1.25.3","1.25.2","1.25.1","1.25.0","v1.23.0","v1.22.0","v1.21.0","v1.20.0","v1.18.0","v1.17.0","v1.16.0","v1.15.0","v1.13.1","v1.12.0","v1.11.0","v1.10.3","v1.10.2","v1.10.1","v1.10.0","v1.9.0","v1.8.0","v1.7.2","v1.7.1","v1.7.0","v1.6.0","v1.5.0","v1.4.0","v1.3.0","v1.2.4","v1.2.3","v1.2.2","v1.2.1","v1.2.0","v1.1.0","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81098.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}