FKIE_CVE-2021-24171

Vulnerability from fkie_nvd - Published: 2021-04-05 19:15 - Updated: 2026-06-17 03:39
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
The WooCommerce Upload Files WordPress plugin before 59.4 ran a single sanitization pass to remove blocked extensions such as .php. It was possible to bypass this and upload a file with a PHP extension by embedding a "blocked" extension within another "blocked" extension in the "wcuf_file_name" parameter. It was also possible to perform a double extension attack and upload files to a different location via path traversal using the "wcuf_current_upload_session_id" parameter.
References
contact@wpscan.comhttps://wpscan.com/vulnerability/ed4288a1-f7e4-455f-b765-5ac343f87194Third Party Advisory
contact@wpscan.comhttps://www.wordfence.com/blog/2021/03/critical-vulnerability-patched-in-woocommerce-upload-files/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://wpscan.com/vulnerability/ed4288a1-f7e4-455f-b765-5ac343f87194Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.wordfence.com/blog/2021/03/critical-vulnerability-patched-in-woocommerce-upload-files/Third Party Advisory
Impacted products
Vendor Product Version
vanquish woocommerce_upload_files *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "WooCommerce Upload Files",
          "vendor": "Unknown",
          "versions": [
            {
              "lessThan": "59.4",
              "status": "affected",
              "version": "59.4",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "contact@wpscan.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:vanquish:woocommerce_upload_files:*:*:*:*:*:wordpress:*:*",
              "matchCriteriaId": "4D755FA2-93D9-4FE2-BB9E-323398084C28",
              "versionEndExcluding": "59.4",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The WooCommerce Upload Files WordPress plugin before 59.4 ran a single sanitization pass to remove blocked extensions such as .php. It was possible to bypass this and upload a file with a PHP extension by embedding a \"blocked\" extension within another \"blocked\" extension in the \"wcuf_file_name\" parameter. It was also possible to perform a double extension attack and upload files to a different location via path traversal using the \"wcuf_current_upload_session_id\" parameter."
    },
    {
      "lang": "es",
      "value": "El plugin de WordPress WooCommerce Upload Files versiones anteriores a 59.4 ejecut\u00f3 una sola pasada de saneamiento para eliminar extensiones bloqueadas como .php.\u0026#xa0;Era posible omitir esto y cargar un archivo con una extensi\u00f3n PHP insertando una extensi\u00f3n \"blocked\" dentro de otra extensi\u00f3n \"blocked\" en el par\u00e1metro \"wcuf_file_name\".\u0026#xa0;Tambi\u00e9n fue posible llevar a cabo un ataque de extensi\u00f3n doble y subir archivos a una ubicaci\u00f3n diferente por medio del salto de ruta usando el par\u00e1metro \"wcuf_current_upload_session_id\""
    }
  ],
  "id": "CVE-2021-24171",
  "lastModified": "2026-06-17T03:39:30.930",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 7.5,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "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": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-04-05T19:15:15.857",
  "references": [
    {
      "source": "contact@wpscan.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://wpscan.com/vulnerability/ed4288a1-f7e4-455f-b765-5ac343f87194"
    },
    {
      "source": "contact@wpscan.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.wordfence.com/blog/2021/03/critical-vulnerability-patched-in-woocommerce-upload-files/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://wpscan.com/vulnerability/ed4288a1-f7e4-455f-b765-5ac343f87194"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.wordfence.com/blog/2021/03/critical-vulnerability-patched-in-woocommerce-upload-files/"
    }
  ],
  "sourceIdentifier": "contact@wpscan.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-434"
        }
      ],
      "source": "contact@wpscan.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-434"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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