FKIE_CVE-2020-13443

Vulnerability from fkie_nvd - Published: 2020-06-24 15:15 - Updated: 2026-06-17 02:53
Severity
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
ExpressionEngine before 5.3.2 allows remote attackers to upload and execute arbitrary code in a .php%20 file via Compose Msg, Add attachment, and Save As Draft actions. A user with low privileges (member) is able to upload this. It is possible to bypass the MIME type check and file-extension check while uploading new files. Short aliases are not used for an attachment; instead, direct access is allowed to the uploaded files. It is possible to upload PHP only if one has member access, or registration/forum is enabled and one can create a member with the default group id of 5. To exploit this, one must to be able to send and compose messages (at least).
References
cve@mitre.orghttps://expressionengine.com/blogVendor Advisory
cve@mitre.orghttps://gist.github.com/mariuszpoplwski/51604d8a6d7d78fffdf590c25e844e09Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://expressionengine.com/blogVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://gist.github.com/mariuszpoplwski/51604d8a6d7d78fffdf590c25e844e09Exploit, Third Party Advisory
Impacted products
Vendor Product Version
expressionengine expressionengine *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:expressionengine:expressionengine:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "AEC89331-D8D0-4AC1-822A-0CB8E2808E4A",
              "versionEndExcluding": "5.3.2",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "ExpressionEngine before 5.3.2 allows remote attackers to upload and execute arbitrary code in a .php%20 file via Compose Msg, Add attachment, and Save As Draft actions. A user with low privileges (member) is able to upload this. It is possible to bypass the MIME type check and file-extension check while uploading new files. Short aliases are not used for an attachment; instead, direct access is allowed to the uploaded files. It is possible to upload PHP only if one has member access, or registration/forum is enabled and one can create a member with the default group id of 5. To exploit this, one must to be able to send and compose messages (at least)."
    },
    {
      "lang": "es",
      "value": "ExpressionEngine versiones anteriores a 5.3.2, permite a atacantes remotos cargar y ejecutar c\u00f3digo arbitrario en un archivo .php%20 por medio de las acciones Componer Msg, Add attachment y Save As Draft. Un usuario con pocos privilegios (miembro) es capaz de cargar esto. Es posible omitir la comprobaci\u00f3n del tipo MIME y la comprobaci\u00f3n de extensi\u00f3n de archivo al cargar nuevos archivos. Los seud\u00f3nimos cortos no se usan para un archivo adjunto; en cambio, se permite el acceso directo a los archivos cargados. Es posible cargar PHP solo si uno tiene acceso de miembro, o registration/forum est\u00e1 habilitado y uno puede crear un miembro con el ID de grupo predeterminado de 5. Para explotar esto, uno debe ser capaz de enviar y redactar mensajes (al menos)"
    }
  ],
  "id": "CVE-2020-13443",
  "lastModified": "2026-06-17T02:53:09.223",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "SINGLE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 6.5,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 8.0,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2020-06-24T15:15:11.617",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://expressionengine.com/blog"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://gist.github.com/mariuszpoplwski/51604d8a6d7d78fffdf590c25e844e09"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://expressionengine.com/blog"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://gist.github.com/mariuszpoplwski/51604d8a6d7d78fffdf590c25e844e09"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-434"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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Sightings

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Nomenclature

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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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