{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-81098","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-08-26T16:00:33.062Z","datePublished":"2026-08-27T14:50:38.327Z","dateUpdated":"2026-08-29T11:48:12.176Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-08-29T11:48:12.176Z"},"datePublic":"2026-08-26T00:00:00.000Z","title":"Telnyx MCP Server through 6.83.0 Missing Authentication on Streamable HTTP Transport","descriptions":[{"lang":"en","value":"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."}],"problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-306","description":"Missing Authentication for Critical Function","type":"CWE"}]}],"affected":[{"vendor":"team-telnyx","product":"telnyx-mcp","collectionURL":"https://github.com/team-telnyx/telnyx-node","repo":"https://github.com/team-telnyx/telnyx-node","defaultStatus":"unaffected","versions":[{"version":"0","lessThanOrEqual":"6.83.0","status":"affected","versionType":"semver"}],"packageURL":"pkg:npm/telnyx-mcp"}],"cpeApplicability":[],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"CRITICAL","baseScore":9.3,"vectorString":"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"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE","version":"3.1","baseSeverity":"CRITICAL","baseScore":9.1,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"}}],"references":[{"url":"https://github.com/team-telnyx/telnyx-node","tags":["product"]},{"url":"https://github.com/team-telnyx/telnyx-node/pull/450","tags":["issue-tracking","patch"]},{"url":"https://github.com/team-telnyx/telnyx-node/security/advisories/GHSA-46jp-xr2h-fw7h","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-46jp-xr2h-fw7h)"},{"name":"VulnCheck Advisory: Telnyx MCP Server through 6.83.0 Missing Authentication on Streamable HTTP Transport","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/telnyx-mcp-server-through-6.83.0-missing-authentication-on-streamable-http-transport"}],"credits":[{"lang":"en","value":"Avishai Gonen (Pluto Security)","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"},"source":{"discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-27T18:47:34.829150Z","id":"CVE-2026-81098","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-27T18:47:58.070Z"}}]}}