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CVE-2026-31818

Estado: AnalizadaCrítica (9.9)—

Budibase is an open-source low-code platform. Prior to version 3.33.4, a server-side request forgery (SSRF) vulnerability exists in Budibase's REST datasource connector. The platform's SSRF protection mechanism (IP blacklist) is rendered completely ineffective because the BLACKLIST_IPS environment variable is not set by default in any of the official deployment configurations. When this variable is empty, the blacklist function unconditionally returns false, allowing all requests through without restriction. This issue has been patched in version 3.33.4.

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.

SSRF sin restricción (blacklist vacía por defecto) en conector REST permite acceso a recursos internos y externos. AV:N/PR:L/C:H/I:H confirma explotación remota con escalada de privilegios. CWE-918 es SSRF puro.

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

Filter Network TrafficVulnerability ScanningThreat Intelligence ProgramSSL/TLS InspectionPrivileged Account ManagementNetwork Segmentation

Tecnologías afectadas (1)

Budibase — Budibase

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-31818",
  "cveTags": [],
  "metrics": {
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      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-31818",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-04-03T20:04:22.287596Z"
        }
      }
    ],
    "cvssMetricV31": [
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        "source": "security-advisories@github.com",
        "cvssData": {
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          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
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        "exploitabilityScore": 3.1
      },
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        "Mitigation",
        "Vendor Advisory"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
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          "value": "CWE-918"
        },
        {
          "lang": "en",
          "value": "CWE-1188"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Budibase is an open-source low-code platform. Prior to version 3.33.4, a server-side request forgery (SSRF) vulnerability exists in Budibase's REST datasource connector. The platform's SSRF protection mechanism (IP blacklist) is rendered completely ineffective because the BLACKLIST_IPS environment variable is not set by default in any of the official deployment configurations. When this variable is empty, the blacklist function unconditionally returns false, allowing all requests through without restriction. This issue has been patched in version 3.33.4."
    },
    {
      "lang": "es",
      "value": "Budibase es una plataforma de código abierto de bajo código. Antes de la versión 3.33.4, existe una vulnerabilidad de falsificación de petición del lado del servidor (SSRF) en el conector de fuente de datos REST de Budibase. El mecanismo de protección SSRF de la plataforma (lista negra de IP) queda completamente ineficaz porque la variable de entorno BLACKLIST_IPS no está configurada por defecto en ninguna de las configuraciones de despliegue oficiales. Cuando esta variable está vacía, la función de lista negra devuelve incondicionalmente falso, permitiendo todas las peticiones sin restricción. Este problema ha sido parcheado en la versión 3.33.4."
    }
  ],
  "lastModified": "2026-07-24T22:10:00.140",
  "configurations": [
    {
      "nodes": [
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          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
              "matchCriteriaId": "B316A29C-7C2F-4102-ACF6-DDB06B3D0AD5",
              "versionEndExcluding": "3.33.4"
            }
          ],
          "operator": "OR"
        }
      ]
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  ],
  "sourceIdentifier": "security-advisories@github.com"
}