Vulnerability-Lookup

GHSA-635P-78XG-J6W3

Vulnerability from github – Published: 2026-10-30 09:31 – Updated: 2026-10-30 09:31

Details

The Gravity Forms plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.1.2 via a Post Custom Field whose input type is List. This is due to GFFormsModel::create_post() passing the submitted value to WordPress' unrestricted global maybe_unserialize() rather than the plugin's own hardened GFCommon::maybe_unserialize(), which was added in 3.1.1 and passes allowed_classes => false precisely to prevent object instantiation. Where the field has a content template enabled, the submitted row reaches that call verbatim. This makes it possible for unauthenticated attackers to inject a PHP object into post meta. No PHP Object Injection gadget chain is present in the plugin itself; however, if a gadget chain is present via an additional plugin or theme, it could allow the attacker to perform actions such as remote code execution. Where the custom field is mapped to the protected _wp_page_template meta key, WordPress itself supplies the chain: validate_file() accepts non-scalars, WP_Theme::__toString() then resolves an attacker-controlled path, and on hosts with a readable PEAR install and register_argc_argv enabled this yields remote code execution.

Severity

9.8 (Critical)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-103039"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-30T07:16:30Z",
    "severity": "CRITICAL"
  },
  "details": "The Gravity Forms plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.1.2 via a Post Custom Field whose input type is List. This is due to GFFormsModel::create_post() passing the submitted value to WordPress\u0027 unrestricted global maybe_unserialize() rather than the plugin\u0027s own hardened GFCommon::maybe_unserialize(), which was added in 3.1.1 and passes allowed_classes =\u003e false precisely to prevent object instantiation. Where the field has a content template enabled, the submitted row reaches that call verbatim. This makes it possible for unauthenticated attackers to inject a PHP object into post meta. No PHP Object Injection gadget chain is present in the plugin itself; however, if a gadget chain is present via an additional plugin or theme, it could allow the attacker to perform actions such as remote code execution. Where the custom field is mapped to the protected _wp_page_template meta key, WordPress itself supplies the chain: validate_file() accepts non-scalars, WP_Theme::__toString() then resolves an attacker-controlled path, and on hosts with a readable PEAR install and register_argc_argv enabled this yields remote code execution.",
  "id": "GHSA-635p-78xg-j6w3",
  "modified": "2026-10-30T09:31:24Z",
  "published": "2026-10-30T09:31:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103039"
    },
    {
      "type": "WEB",
      "url": "https://docs.gravityforms.com"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/ec1fba15-81e5-42e3-9154-1978c3f81b26?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"
    }
  ]
}

CVE-2026-103039 (GCVE-0-2026-103039)

Vulnerability from cvelistv5 – Published: 2026-10-30 06:47 – Updated: 2026-10-30 15:57

Title

Gravity Forms <= 3.1.2 - Unauthenticated PHP Object Injection via Post Custom Field

Summary

Severity

9.8 (Critical)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-30 15:48 UTC

CWE

CWE-502 - Deserialization of Untrusted Data

Assigner

Wordfence CNA under the mitre root

CNA scorecard C 65/100 over 2368 records in the last 180 days details

References

2 references

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

Impacted products

1 product

Vendor	Product	Version
Gravity Forms	Gravity Forms	Affected: 0 , ≤ 3.1.2 (semver)

Credits

Tin Pham (TF1T) Hao Ngo Trong Pham

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-103039",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-30T15:48:33.243446Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-30T15:57:19.794Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Gravity Forms",
          "vendor": "Gravity Forms",
          "versions": [
            {
              "lessThanOrEqual": "3.1.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Tin Pham (TF1T)"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Hao Ngo"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Trong Pham"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The Gravity Forms plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.1.2 via a Post Custom Field whose input type is List. This is due to GFFormsModel::create_post() passing the submitted value to WordPress\u0027 unrestricted global maybe_unserialize() rather than the plugin\u0027s own hardened GFCommon::maybe_unserialize(), which was added in 3.1.1 and passes allowed_classes =\u003e false precisely to prevent object instantiation. Where the field has a content template enabled, the submitted row reaches that call verbatim. This makes it possible for unauthenticated attackers to inject a PHP object into post meta. No PHP Object Injection gadget chain is present in the plugin itself; however, if a gadget chain is present via an additional plugin or theme, it could allow the attacker to perform actions such as remote code execution. Where the custom field is mapped to the protected _wp_page_template meta key, WordPress itself supplies the chain: validate_file() accepts non-scalars, WP_Theme::__toString() then resolves an attacker-controlled path, and on hosts with a readable PEAR install and register_argc_argv enabled this yields remote code execution."
        }
      ],
      "metrics": [
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            "version": "3.1"
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      "problemTypes": [
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          "descriptions": [
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              "description": "CWE-502 Deserialization of Untrusted Data",
              "lang": "en",
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      "providerMetadata": {
        "dateUpdated": "2026-10-30T06:47:32.599Z",
        "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
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      },
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          "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/ec1fba15-81e5-42e3-9154-1978c3f81b26?source=cve"
        },
        {
          "url": "https://docs.gravityforms.com/"
        }
      ],
      "timeline": [
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          "lang": "en",
          "time": "2026-09-30T13:29:24.000Z",
          "value": "Vendor Notified"
        },
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          "lang": "en",
          "time": "2026-10-29T18:29:20.000Z",
          "value": "Disclosed"
        }
      ],
      "title": "Gravity Forms \u003c= 3.1.2 - Unauthenticated PHP Object Injection via Post Custom Field"
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    "datePublished": "2026-10-30T06:47:32.599Z",
    "dateReserved": "2026-09-29T22:08:12.516Z",
    "dateUpdated": "2026-10-30T15:57:19.794Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.
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