Vulnerability-Lookup

CVE-2026-84434 (GCVE-0-2026-84434)

Vulnerability from cvelistv5 – Published: 2026-09-19 02:27 – Updated: 2026-09-19 02:27

Title

Gravity Forms <= 3.1.0.4 - Unauthenticated Arbitrary File Upload via Hidden File Upload Field

Summary

The Gravity Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.1.0.4 via the upload_file function. This is due to a mismatch between the field validation pipeline and the file persistence pipeline, where hidden file upload fields bypass extension validation and a rejected file's intact upload state is later passed to upload_file() without re-validation. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. Exploitation requires the targeted form to contain a File Upload field with its Visibility set to 'Hidden'; the vulnerability is reachable by unauthenticated attackers on any publicly accessible form meeting this condition.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-434 - Unrestricted Upload of File with Dangerous Type

Assigner

Wordfence mitre root

References

2 references

URL	Tags
https://www.wordfence.com/threat-intel/vulnerabil…
https://docs.gravityforms.com/gravityforms-change-log/

Impacted products

1 product

Vendor	Product	Version	CPE status
Gravity Forms	Gravity Forms	Affected: 0 , ≤ 3.1.0.4 (semver)	guessed

Credits

0xd4rk5id3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Gravity Forms",
          "vendor": "Gravity Forms",
          "versions": [
            {
              "lessThanOrEqual": "3.1.0.4",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "0xd4rk5id3"
        }
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      "descriptions": [
        {
          "lang": "en",
          "value": "The Gravity Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.1.0.4 via the upload_file function. This is due to a mismatch between the field validation pipeline and the file persistence pipeline, where hidden file upload fields bypass extension validation and a rejected file\u0027s intact upload state is later passed to upload_file() without re-validation. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. Exploitation requires the targeted form to contain a File Upload field with its Visibility set to \u0027Hidden\u0027; the vulnerability is reachable by unauthenticated attackers on any publicly accessible form meeting this condition."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/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": "2026-09-19T02:27:09.915Z",
        "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
        "shortName": "Wordfence"
      },
      "references": [
        {
          "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/787e22a9-329b-4e71-bc2a-4f5524fc9356?source=cve"
        },
        {
          "url": "https://docs.gravityforms.com/gravityforms-change-log/"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-09-01T19:16:54.000Z",
          "value": "Vendor Notified"
        },
        {
          "lang": "en",
          "time": "2026-09-18T13:56:54.000Z",
          "value": "Disclosed"
        }
      ],
      "title": "Gravity Forms \u003c= 3.1.0.4 - Unauthenticated Arbitrary File Upload via Hidden File Upload Field"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
    "assignerShortName": "Wordfence",
    "cveId": "CVE-2026-84434",
    "datePublished": "2026-09-19T02:27:09.915Z",
    "dateReserved": "2026-09-01T19:01:43.199Z",
    "dateUpdated": "2026-09-19T02:27:09.915Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Gravity Forms",
                "vendor": "Gravity Forms",
                "versions": [
                  {
                    "lessThanOrEqual": "3.1.0.4",
                    "status": "affected",
                    "version": "0",
                    "versionType": "semver"
                  }
                ]
              }
            ],
            "source": "security@wordfence.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "The Gravity Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.1.0.4 via the upload_file function. This is due to a mismatch between the field validation pipeline and the file persistence pipeline, where hidden file upload fields bypass extension validation and a rejected file\u0027s intact upload state is later passed to upload_file() without re-validation. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. Exploitation requires the targeted form to contain a File Upload field with its Visibility set to \u0027Hidden\u0027; the vulnerability is reachable by unauthenticated attackers on any publicly accessible form meeting this condition."
          }
        ],
        "id": "CVE-2026-84434",
        "lastModified": "2026-09-19T03:17:15.573",
        "metrics": {
          "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": "security@wordfence.com",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-09-19T03:17:15.573",
        "references": [
          {
            "source": "security@wordfence.com",
            "url": "https://docs.gravityforms.com/gravityforms-change-log/"
          },
          {
            "source": "security@wordfence.com",
            "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/787e22a9-329b-4e71-bc2a-4f5524fc9356?source=cve"
          }
        ],
        "sourceIdentifier": "security@wordfence.com",
        "vulnStatus": "Received",
        "weaknesses": [
          {
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}

GHSA-X9X4-5G6J-PVJ3

Vulnerability from github – Published: 2026-09-19 03:32 – Updated: 2026-09-19 03:32

Details

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-84434"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-434"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-19T03:17:15Z",
    "severity": "CRITICAL"
  },
  "details": "The Gravity Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.1.0.4 via the upload_file function. This is due to a mismatch between the field validation pipeline and the file persistence pipeline, where hidden file upload fields bypass extension validation and a rejected file\u0027s intact upload state is later passed to upload_file() without re-validation. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. Exploitation requires the targeted form to contain a File Upload field with its Visibility set to \u0027Hidden\u0027; the vulnerability is reachable by unauthenticated attackers on any publicly accessible form meeting this condition.",
  "id": "GHSA-x9x4-5g6j-pvj3",
  "modified": "2026-09-19T03:32:02Z",
  "published": "2026-09-19T03:32:02Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84434"
    },
    {
      "type": "WEB",
      "url": "https://docs.gravityforms.com/gravityforms-change-log"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/787e22a9-329b-4e71-bc2a-4f5524fc9356?source=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.