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CVE-2026-22799

Estado: AnalizadaCrítica (9.3)—

Emlog is an open source website building system. emlog v2.6.1 and earlier exposes a REST API endpoint (/index.php?rest-api=upload) for media file uploads. The endpoint fails to implement proper validation of file types, extensions, and content, allowing authenticated attackers (with a valid API key or admin session cookie) to upload arbitrary files (including malicious PHP scripts) to the server. An attacker can obtain the API key either by gaining administrator access to enable the REST API setting, or via information disclosure vulnerabilities in the application. Once uploaded, the malicious PHP file can be executed to gain remote code execution (RCE) on the target server, leading to full server compromise.

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.

REST API endpoint expuesto sin validación de archivos permite carga de scripts PHP maliciosos (CWE-434). Acceso red sin privilegios requeridos (AV:N/PR:N) → T1190. Web shell (T1505.003) y ejecución de código (T1059) como impactos confirmados por RCE descrito.

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 ManagementDisable or Remove Feature or ProgramVulnerability ScanningUser Account ManagementRestrict Web-Based ContentNetwork Segmentation

Tecnologías afectadas (1)

Emlog — Emlog

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-22799",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-22799",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-01-13T14:14:13.409424Z"
        }
      }
    ],
    "cvssMetricV31": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "NETWORK",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
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          "attackComplexity": "LOW",
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          "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": 9.3,
          "Automatable": "NOT_DEFINED",
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "valueDensity": "NOT_DEFINED",
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          "exploitMaturity": "NOT_DEFINED",
          "providerUrgency": "NOT_DEFINED",
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          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
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          "vulnAvailabilityImpact": "HIGH",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "subConfidentialityImpact": "NONE",
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          "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"
        }
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  "affected": [
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      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "emlog",
          "product": "emlog",
          "versions": [
            {
              "status": "affected",
              "version": "<= 2.6.1"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-01-12T22:16:08.930",
  "references": [
    {
      "url": "https://github.com/emlog/emlog/commit/429b02fda842254b9b9b39303e9161999c180560",
      "tags": [
        "Patch"
      ],
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    },
    {
      "url": "https://github.com/emlog/emlog/security/advisories/GHSA-p837-mrw9-5x5j",
      "tags": [
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      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/emlog/emlog/security/advisories/GHSA-p837-mrw9-5x5j",
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        "Vendor Advisory"
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      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-434"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Emlog is an open source website building system. emlog v2.6.1 and earlier exposes a REST API endpoint (/index.php?rest-api=upload) for media file uploads. The endpoint fails to implement proper validation of file types, extensions, and content, allowing authenticated attackers (with a valid API key or admin session cookie) to upload arbitrary files (including malicious PHP scripts) to the server. An attacker can obtain the API key either by gaining administrator access to enable the REST API setting, or via information disclosure vulnerabilities in the application. Once uploaded, the malicious PHP file can be executed to gain remote code execution (RCE) on the target server, leading to full server compromise."
    },
    {
      "lang": "es",
      "value": "Emlog es un sistema de creación de sitios web de código abierto. emlog v2.6.1 y versiones anteriores expone un endpoint de API REST (/index.php?rest-api=upload) para la carga de archivos multimedia. El endpoint no implementa una validación adecuada de tipos de archivo, extensiones y contenido, permitiendo a atacantes autenticados (con una clave API válida o una cookie de sesión de administrador) cargar archivos arbitrarios (incluidos scripts PHP maliciosos) al servidor. Un atacante puede obtener la clave API ya sea obteniendo acceso de administrador para habilitar la configuración de la API REST, o a través de vulnerabilidades de revelación de información en la aplicación. Una vez cargado, el archivo PHP malicioso puede ser ejecutado para obtener ejecución remota de código (RCE) en el servidor objetivo, lo que lleva a un compromiso total del servidor."
    }
  ],
  "lastModified": "2026-06-17T10:20:27.100",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:emlog:emlog:*:*:*:*:pro:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "690F5B09-FDEA-46BF-B0FB-09CA94511539",
              "versionEndExcluding": "2.6.1"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security-advisories@github.com"
}