CVE-2025-66294

Estado: AnalizadaAlta (8.7)—

Grav is a file-based Web platform. Prior to 1.8.0-beta.27, a Server-Side Template Injection (SSTI) vulnerability exists in Grav that allows authenticated attackers with editor permissions to execute arbitrary commands on the server and, under certain conditions, may also be exploited by unauthenticated attackers. This vulnerability stems from weak regex validation in the cleanDangerousTwig method. This vulnerability is fixed in 1.8.0-beta.27.

CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Puntuación base: 8.7

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 2.82%
Percentil entre todas las CVEs puntuadas: 86
Fecha de la puntuación: 5/10/2026

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.

ExplotaciónT1210 Exploitation of Remote Serviceslateral movement75 %
Impacto principalT1059 Command and Scripting Interpreterexecution85 %
Impacto secundarioT1078 Valid Accountsstealth · persistence · privilege escalation · initial access60 %

SSTI en servicio remoto Grav requiere PR:L (acceso autenticado) → T1210. SSTI ejecuta comandos arbitrarios (T1059). Acceso con editor permite ejecución sin validación de regex → impacto secundario de abuso de credenciales (T1078).

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 Management Disable or Remove Feature or Program Application Developer Guidance Active Directory Configuration Vulnerability Scanning User Training

Tecnologías afectadas (1)

Getgrav — Grav

CWE

CWE-94, CWE-1336

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2025-66294",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-66294",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-12-02T14:05:10.905709Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      }
    ],
    "cvssMetricV40": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "Safety": "NOT_DEFINED",
          "version": "4.0",
          "Recovery": "NOT_DEFINED",
          "baseScore": 8.7,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "privilegesRequired": "LOW",
          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "vulnAvailabilityImpact": "HIGH",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
        }
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "getgrav",
          "product": "grav",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.8.0-beta.27"
            }
          ]
        }
      ]
    }
  ],
  "published": "2025-12-01T21:15:52.843",
  "references": [
    {
      "url": "https://github.com/getgrav/grav/commit/e37259527d9c1deb6200f8967197a9fa587c6458",
      "tags": [
        "Patch"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/getgrav/grav/security/advisories/GHSA-662m-56v4-3r8f",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-94"
        },
        {
          "lang": "en",
          "value": "CWE-1336"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Grav is a file-based Web platform. Prior to 1.8.0-beta.27, a Server-Side Template Injection (SSTI) vulnerability exists in Grav that allows authenticated attackers with editor permissions to execute arbitrary commands on the server and, under certain conditions, may also be exploited by unauthenticated attackers. This vulnerability stems from weak regex validation in the cleanDangerousTwig method. This vulnerability is fixed in 1.8.0-beta.27."
    },
    {
      "lang": "es",
      "value": "Grav es una plataforma web basada en archivos. Versiones anteriores a 1.8.0-beta.27, existe una vulnerabilidad de inyección de plantillas del lado del servidor (SSTI) en Grav que permite a atacantes autenticados con permisos de editor ejecutar comandos arbitrarios en el servidor y, bajo ciertas condiciones, también puede ser explotada por atacantes no autenticados. Esta vulnerabilidad se origina en una validación de expresiones regulares (regex) débil en el método cleanDangerousTwig. Esta vulnerabilidad está corregida en 1.8.0-beta.27."
    }
  ],
  "lastModified": "2026-09-26T00:10:00.127",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:getgrav:grav:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EAC8A2F1-9318-4224-9CF5-D3EFE16E81F4",
              "versionEndExcluding": "1.8.0",
              "versionStartIncluding": "1.7.48"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8A383F2E-C6BA-440B-B648-A3313B7D91C3"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta10:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F7EF2DEC-2798-4D0D-9C27-0F01BAFEAEFD"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta11:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "530C6F64-F30B-4E93-9A12-D9625EA57483"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta12:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9AC28BF9-626D-4514-91F0-F81DAB5D3602"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta13:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "307AA375-E531-4AE5-BA79-2F9D4DE7A05F"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta14:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C2E3E312-485D-42B0-B465-64B6438CDCAE"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta15:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5BE4B2F9-1B6D-4D18-916A-5C95A3213222"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta16:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "763207F0-92D1-4274-A30A-DE634C5852C3"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta17:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1DE8F350-BA07-4DAA-AE4B-5E0A532B6828"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta18:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F9150B94-0DF3-43F3-9806-39787A6C0E4D"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta19:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BAA7C7EC-8FB2-445D-8A02-1743D87F5416"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7A6BEA2A-D534-4C9E-811A-8A46E214C46D"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta20:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7A644F57-FF39-4262-9796-7C4F3B0851C1"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta21:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B2AFB9E7-084E-497B-B0FC-CA6A5033C5BF"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta22:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5C5E8823-9083-4FFA-9897-CAD0340DCE68"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta23:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9C048938-E0EC-4AD0-9847-FD74E6770FE2"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta24:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F7B43876-1445-418A-9707-E692FDF62C4D"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta25:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "94B209DE-01C6-41BA-B912-CF57849A9F7A"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta26:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "AB53AA10-87A5-4010-8019-BF4AA5ABC12B"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "775E0913-F3EF-4A55-B162-5BF9C6E2E641"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3C3E022E-35CB-40AD-959A-F39949E38BD3"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta5:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8779C813-A81A-4E21-AB86-6193933568BC"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta6:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B608EDD4-207A-41A7-A60D-496FDA8EAFEA"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta7:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "AE1F2253-3EE0-4ADD-B8A5-C882A60FC626"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta8:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "81D4C859-5560-42F1-ACD9-65210E523F28"
            },
            {
              "criteria": "cpe:2.3:a:getgrav:grav:1.8.0:beta9:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "156707A7-9507-4AC1-9CD0-90E32836E9DF"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}