CVE-2026-5718 (GCVE-0-2026-5718)

Vulnerability from cvelistv5 – Published: 2026-04-17 17:25 – Updated: 2026-04-17 18:34
VLAI?
Title
Drag and Drop Multiple File Upload for Contact Form 7 <= 1.3.9.6 - Unauthenticated Arbitrary File Upload via Non-ASCII Filename Blacklist Bypass
Summary
The Drag and Drop Multiple File Upload for Contact Form 7 plugin for WordPress is vulnerable to arbitrary file upload in versions up to, and including, 1.3.9.6. This is due to insufficient file type validation that occurs when custom blacklist types are configured, which replaces the default dangerous extension denylist instead of merging with it, and the wpcf7_antiscript_file_name() sanitization function being bypassed for filenames containing non-ASCII characters. This makes it possible for unauthenticated attackers to upload arbitrary files, such as PHP files, to the server, which can be leveraged to achieve remote code execution.
Severity ?
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
Impacted products
Vendor Product Version
glenwpcoder Drag and Drop Multiple File Upload for Contact Form 7 Affected: 0 , ≤ 1.3.9.6 (semver)
Create a notification for this product.
Credits
Leonid Semenenko
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-5718",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-17T18:34:36.658481Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-17T18:34:48.917Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Drag and Drop Multiple File Upload for Contact Form 7",
          "vendor": "glenwpcoder",
          "versions": [
            {
              "lessThanOrEqual": "1.3.9.6",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Leonid Semenenko"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The Drag and Drop Multiple File Upload for Contact Form 7 plugin for WordPress is vulnerable to arbitrary file upload in versions up to, and including, 1.3.9.6. This is due to insufficient file type validation that occurs when custom blacklist types are configured, which replaces the default dangerous extension denylist instead of merging with it, and the wpcf7_antiscript_file_name() sanitization function being bypassed for filenames containing non-ASCII characters. This makes it possible for unauthenticated attackers to upload arbitrary files, such as PHP files, to the server, which can be leveraged to achieve remote code execution."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-434",
              "description": "CWE-434 Unrestricted Upload of File with Dangerous Type",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-17T17:25:55.466Z",
        "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
        "shortName": "Wordfence"
      },
      "references": [
        {
          "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/38f95d40-a6d4-429c-9872-9d2531e942eb?source=cve"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/drag-and-drop-multiple-file-upload-contact-form-7/tags/1.3.9.6/inc/dnd-upload-cf7.php#L987"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/drag-and-drop-multiple-file-upload-contact-form-7/tags/1.3.9.6/inc/dnd-upload-cf7.php#L883"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/drag-and-drop-multiple-file-upload-contact-form-7/tags/1.3.9.6/inc/dnd-upload-cf7.php#L970"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/drag-and-drop-multiple-file-upload-contact-form-7/tags/1.3.9.6/inc/dnd-upload-cf7.php#L62"
        },
        {
          "url": "https://plugins.trac.wordpress.org/changeset/3508522/drag-and-drop-multiple-file-upload-contact-form-7"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-04-06T18:50:46.000Z",
          "value": "Vendor Notified"
        },
        {
          "lang": "en",
          "time": "2026-04-17T04:37:16.000Z",
          "value": "Disclosed"
        }
      ],
      "title": "Drag and Drop Multiple File Upload for Contact Form 7 \u003c= 1.3.9.6 - Unauthenticated Arbitrary File Upload via Non-ASCII Filename Blacklist Bypass"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
    "assignerShortName": "Wordfence",
    "cveId": "CVE-2026-5718",
    "datePublished": "2026-04-17T17:25:55.466Z",
    "dateReserved": "2026-04-06T18:35:21.089Z",
    "dateUpdated": "2026-04-17T18:34:48.917Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-5718\",\"sourceIdentifier\":\"security@wordfence.com\",\"published\":\"2026-04-17T18:16:32.753\",\"lastModified\":\"2026-04-17T18:16:32.753\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"The Drag and Drop Multiple File Upload for Contact Form 7 plugin for WordPress is vulnerable to arbitrary file upload in versions up to, and including, 1.3.9.6. This is due to insufficient file type validation that occurs when custom blacklist types are configured, which replaces the default dangerous extension denylist instead of merging with it, and the wpcf7_antiscript_file_name() sanitization function being bypassed for filenames containing non-ASCII characters. This makes it possible for unauthenticated attackers to upload arbitrary files, such as PHP files, to the server, which can be leveraged to achieve remote code execution.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security@wordfence.com\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.2,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"security@wordfence.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-434\"}]}],\"references\":[{\"url\":\"https://plugins.trac.wordpress.org/browser/drag-and-drop-multiple-file-upload-contact-form-7/tags/1.3.9.6/inc/dnd-upload-cf7.php#L62\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/drag-and-drop-multiple-file-upload-contact-form-7/tags/1.3.9.6/inc/dnd-upload-cf7.php#L883\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/drag-and-drop-multiple-file-upload-contact-form-7/tags/1.3.9.6/inc/dnd-upload-cf7.php#L970\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/browser/drag-and-drop-multiple-file-upload-contact-form-7/tags/1.3.9.6/inc/dnd-upload-cf7.php#L987\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://plugins.trac.wordpress.org/changeset/3508522/drag-and-drop-multiple-file-upload-contact-form-7\",\"source\":\"security@wordfence.com\"},{\"url\":\"https://www.wordfence.com/threat-intel/vulnerabilities/id/38f95d40-a6d4-429c-9872-9d2531e942eb?source=cve\",\"source\":\"security@wordfence.com\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-5718\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-17T18:34:36.658481Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-17T18:34:43.063Z\"}}], \"cna\": {\"title\": \"Drag and Drop Multiple File Upload for Contact Form 7 \u003c= 1.3.9.6 - Unauthenticated Arbitrary File Upload via Non-ASCII Filename Blacklist Bypass\", \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Leonid Semenenko\"}], \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 8.1, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H\"}}], \"affected\": [{\"vendor\": \"glenwpcoder\", \"product\": \"Drag and Drop Multiple File Upload for Contact Form 7\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"1.3.9.6\"}], \"defaultStatus\": \"unaffected\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2026-04-06T18:50:46.000Z\", \"value\": \"Vendor Notified\"}, {\"lang\": \"en\", \"time\": \"2026-04-17T04:37:16.000Z\", \"value\": \"Disclosed\"}], \"references\": [{\"url\": \"https://www.wordfence.com/threat-intel/vulnerabilities/id/38f95d40-a6d4-429c-9872-9d2531e942eb?source=cve\"}, {\"url\": \"https://plugins.trac.wordpress.org/browser/drag-and-drop-multiple-file-upload-contact-form-7/tags/1.3.9.6/inc/dnd-upload-cf7.php#L987\"}, {\"url\": \"https://plugins.trac.wordpress.org/browser/drag-and-drop-multiple-file-upload-contact-form-7/tags/1.3.9.6/inc/dnd-upload-cf7.php#L883\"}, {\"url\": \"https://plugins.trac.wordpress.org/browser/drag-and-drop-multiple-file-upload-contact-form-7/tags/1.3.9.6/inc/dnd-upload-cf7.php#L970\"}, {\"url\": \"https://plugins.trac.wordpress.org/browser/drag-and-drop-multiple-file-upload-contact-form-7/tags/1.3.9.6/inc/dnd-upload-cf7.php#L62\"}, {\"url\": \"https://plugins.trac.wordpress.org/changeset/3508522/drag-and-drop-multiple-file-upload-contact-form-7\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"The Drag and Drop Multiple File Upload for Contact Form 7 plugin for WordPress is vulnerable to arbitrary file upload in versions up to, and including, 1.3.9.6. This is due to insufficient file type validation that occurs when custom blacklist types are configured, which replaces the default dangerous extension denylist instead of merging with it, and the wpcf7_antiscript_file_name() sanitization function being bypassed for filenames containing non-ASCII characters. This makes it possible for unauthenticated attackers to upload arbitrary files, such as PHP files, to the server, which can be leveraged to achieve remote code execution.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-434\", \"description\": \"CWE-434 Unrestricted Upload of File with Dangerous Type\"}]}], \"providerMetadata\": {\"orgId\": \"b15e7b5b-3da4-40ae-a43c-f7aa60e62599\", \"shortName\": \"Wordfence\", \"dateUpdated\": \"2026-04-17T17:25:55.466Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-5718\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-17T18:34:48.917Z\", \"dateReserved\": \"2026-04-06T18:35:21.089Z\", \"assignerOrgId\": \"b15e7b5b-3da4-40ae-a43c-f7aa60e62599\", \"datePublished\": \"2026-04-17T17:25:55.466Z\", \"assignerShortName\": \"Wordfence\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.



Detection rules are retrieved from Rulezet.