Vulnerability-Lookup

GHSA-FXJG-WRWJ-M45J

Vulnerability from github – Published: 2026-05-28 09:31 – Updated: 2026-05-28 09:31

Details

The GutenBee – Gutenberg Blocks plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.20.1 via the gutenbee_file_and_ext_json function. This is due to a flawed strpos() substring check that only verifies whether the filename contains the string '.json' rather than confirming the filename ends with a .json extension, allowing double-extension filenames like shell.json.php to bypass validation. This makes it possible for authenticated attackers, with author-level access and above, to upload files that may be executable, which makes remote code execution possible.

Severity

8.8 (High)


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

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-9227"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-434"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-28T08:16:37Z",
    "severity": "HIGH"
  },
  "details": "The GutenBee \u2013 Gutenberg Blocks plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.20.1 via the gutenbee_file_and_ext_json function. This is due to a flawed strpos() substring check that only verifies whether the filename contains the string \u0027.json\u0027 rather than confirming the filename ends with a .json extension, allowing double-extension filenames like shell.json.php to bypass validation. This makes it possible for authenticated attackers, with author-level access and above, to upload files that may be executable, which makes remote code execution possible.",
  "id": "GHSA-fxjg-wrwj-m45j",
  "modified": "2026-05-28T09:31:19Z",
  "published": "2026-05-28T09:31:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9227"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cssigniter/gutenbee/commit/bde934cdecf67a4de1d6548cc1fc6c59bc6690e5"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php#L570"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php#L571"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php#L579"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php#L570"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php#L571"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php#L579"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/changeset?sfp_email=\u0026sfph_mail=\u0026reponame=\u0026old=3543574%40gutenbee\u0026new=3543574%40gutenbee\u0026sfp_email=\u0026sfph_mail="
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/2d20e8c9-975d-4e8c-8bea-50935853c7d4?source=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-9227 (GCVE-0-2026-9227)

Vulnerability from cvelistv5 – Published: 2026-05-28 06:45 – Updated: 2026-05-28 10:35

Title

GutenBee <= 2.20.1 - Authenticated (Author+) Arbitrary File Upload via wp_check_filetype_and_ext Filter

Summary

Severity

8.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-28 10:27 UTC

CWE

CWE-434 - Unrestricted Upload of File with Dangerous Type

Assigner

Wordfence mitre root

References

9 references

URL	Tags
https://www.wordfence.com/threat-intel/vulnerabil…
https://plugins.trac.wordpress.org/browser/gutenb…
https://plugins.trac.wordpress.org/browser/gutenb…
https://plugins.trac.wordpress.org/browser/gutenb…
https://plugins.trac.wordpress.org/browser/gutenb…
https://plugins.trac.wordpress.org/browser/gutenb…
https://plugins.trac.wordpress.org/browser/gutenb…
https://github.com/cssigniter/gutenbee/commit/bde…
https://plugins.trac.wordpress.org/changeset?sfp_…

Impacted products

1 product

Vendor	Product	Version
cssigniterteam	GutenBee – Gutenberg Blocks	Affected: 0 , ≤ 2.20.1 (semver)

Credits

Athiwat Tiprasaharn

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-9227",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-28T10:27:37.477965Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-28T10:35:06.797Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "GutenBee \u2013 Gutenberg Blocks",
          "vendor": "cssigniterteam",
          "versions": [
            {
              "lessThanOrEqual": "2.20.1",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Athiwat Tiprasaharn"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The GutenBee \u2013 Gutenberg Blocks plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.20.1 via the gutenbee_file_and_ext_json function. This is due to a flawed strpos() substring check that only verifies whether the filename contains the string \u0027.json\u0027 rather than confirming the filename ends with a .json extension, allowing double-extension filenames like shell.json.php to bypass validation. This makes it possible for authenticated attackers, with author-level access and above, to upload files that may be executable, which makes remote code execution possible."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/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",
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      "providerMetadata": {
        "dateUpdated": "2026-05-28T06:45:39.874Z",
        "orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
        "shortName": "Wordfence"
      },
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        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php#L571"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php#L570"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php#L579"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php#L571"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php#L570"
        },
        {
          "url": "https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php#L579"
        },
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          "url": "https://github.com/cssigniter/gutenbee/commit/bde934cdecf67a4de1d6548cc1fc6c59bc6690e5"
        },
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          "url": "https://plugins.trac.wordpress.org/changeset?sfp_email=\u0026sfph_mail=\u0026reponame=\u0026old=3543574%40gutenbee\u0026new=3543574%40gutenbee\u0026sfp_email=\u0026sfph_mail="
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-05-21T18:47:37.000Z",
          "value": "Vendor Notified"
        },
        {
          "lang": "en",
          "time": "2026-05-27T18:02:02.000Z",
          "value": "Disclosed"
        }
      ],
      "title": "GutenBee \u003c= 2.20.1 - Authenticated (Author+) Arbitrary File Upload via wp_check_filetype_and_ext Filter"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
    "assignerShortName": "Wordfence",
    "cveId": "CVE-2026-9227",
    "datePublished": "2026-05-28T06:45:39.874Z",
    "dateReserved": "2026-05-21T18:32:17.661Z",
    "dateUpdated": "2026-05-28T10:35:06.797Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

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.