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CVE-2026-73299

Estado: AplazadaCrítica (10)—

Prompty is a markdown file format (.prompty) for LLM prompts. Prior to 0.1.5 and 2.0.0-beta.5, the TypeScript Nunjucks renderer evaluated untrusted .prompty template bodies with unrestricted JavaScript member access. An attacker-controlled template could traverse constructor and prototype properties to execute JavaScript in the host Node.js process. This issue is fixed in versions 0.1.5 and 2.0.0-beta.5.

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.

AV:N/AC:L/PR:N: exposición remota sin privilegios. CWE-94 (ejecución de código): el renderer Nunjucks ejecuta JavaScript no sanitizado del fichero .prompty, permitiendo RCE en Node.js mediante traversal de prototipos.

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 ManagementVulnerability ScanningRestrict Web-Based ContentNetwork SegmentationLimit Software InstallationLimit Access to Resource Over Network

Tecnologías afectadas (1)

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

Prompty — PromptyAI

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-73299",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-73299",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-08-12T18:53:50.277151Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 10,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "microsoft",
          "product": "prompty",
          "versions": [
            {
              "status": "affected",
              "version": "< 0.1.5"
            },
            {
              "status": "affected",
              "version": ">= 2.0.0-alpha.1, < 2.0.0-beta.5"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-08-12T18:18:15.197",
  "references": [
    {
      "url": "https://github.com/microsoft/prompty/commit/e4a0ebf49e3a78d5d7796c8480bf9a4f0c54d19e",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/microsoft/prompty/commit/f5c57c94a0990cca79d095c3daab661b4b1fb89f",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/microsoft/prompty/pull/404",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/microsoft/prompty/pull/405",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/microsoft/prompty/security/advisories/GHSA-w28w-gp39-m4p6",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/microsoft/prompty/tree/typescript/2.0.0-beta.5",
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-94"
        },
        {
          "lang": "en",
          "value": "CWE-1336"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Prompty is a markdown file format (.prompty) for LLM prompts. Prior to 0.1.5 and 2.0.0-beta.5, the TypeScript Nunjucks renderer evaluated untrusted .prompty template bodies with unrestricted JavaScript member access. An attacker-controlled template could traverse constructor and prototype properties to execute JavaScript in the host Node.js process. This issue is fixed in versions 0.1.5 and 2.0.0-beta.5."
    }
  ],
  "lastModified": "2026-09-09T21:02:22.660",
  "sourceIdentifier": "security-advisories@github.com"
}