GHSA-FXJG-WRWJ-M45J

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

{
  "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"
    }
  ]
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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

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.