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CVE-2026-81098

Estado: AplazadaCrítica (9.3)—

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

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Servidor HTTP expuesto sin autenticación en todas las interfaces (AV:N, PR:N, UI:N). Acceso remoto directo a credenciales API y clave de ejecución sin validación, permitiendo suplantación de identidad y ejecución de herramientas.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementApplication Developer GuidanceActive Directory ConfigurationVulnerability ScanningUser TrainingUser Account Management

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Telnyx — MCP ServerAI

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2026-81098",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2026-81098",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
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          "version": "2.0.3",
          "timestamp": "2026-08-27T18:47:34.829150Z"
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    "cvssMetricV31": [
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          "integrityImpact": "HIGH",
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      }
    ],
    "cvssMetricV40": [
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          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "valueDensity": "NOT_DEFINED",
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          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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          "vendor": "team-telnyx",
          "product": "telnyx-mcp",
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              "version": "0",
              "versionType": "semver",
              "lessThanOrEqual": "6.83.0"
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          "packageURL": "pkg:npm/telnyx-mcp",
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  "published": "2026-08-27T17:20:52.297",
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      "url": "https://github.com/team-telnyx/telnyx-node",
      "source": "disclosure@vulncheck.com"
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    {
      "url": "https://github.com/team-telnyx/telnyx-node/pull/450",
      "source": "disclosure@vulncheck.com"
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      "url": "https://github.com/team-telnyx/telnyx-node/security/advisories/GHSA-46jp-xr2h-fw7h",
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      "source": "disclosure@vulncheck.com"
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    {
      "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."
    }
  ],
  "lastModified": "2026-09-24T20:43:32.537",
  "sourceIdentifier": "disclosure@vulncheck.com"
}