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

{
  "id": "d12f219ae17d31fe950c973d97f842141cffbe20eb1ee84b48806382ef0d7a1b",
  "url": "https://osv.dev/vulnerability/CVE-2026-9227",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "GutenBee <= 2.20.1 - Authenticated (Author+) Arbitrary File Upload via wp_check_filetype_and_ext Filter",
    "summary": "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.",
    "evidence": "osv:CVE-2026-9227",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-9227",
      "aliases": [
        "CVE-2026-9227"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/cssigniter/gutenbee",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "bde934cdecf67a4de1d6548cc1fc6c59bc6690e5"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.20.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "bde934cdecf67a4de1d6548cc1fc6c59bc6690e5"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.20.1",
            "2.20.0",
            "2.19.1",
            "2.19.0",
            "2.18.1",
            "2.18.0",
            "2.17.4",
            "2.17.3",
            "2.17.2",
            "2.17.1",
            "2.17.0",
            "2.16.1",
            "2.16.0",
            "2.15.0",
            "2.14.0",
            "2.13.1",
            "2.13.0",
            "2.12.5",
            "2.12.4",
            "2.12.3",
            "2.12.2",
            "2.12.1",
            "2.12.0",
            "2.11.1",
            "2.11.0",
            "2.10.6",
            "2.10.5",
            "2.10.4",
            "2.10.3",
            "2.10.2",
            "2.10.1",
            "2.10.0",
            "2.9.0",
            "2.8.1",
            "2.8.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-9227.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.501966973Z",
      "provider": "osv",
      "references": [
        "https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php#L570",
        "https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php#L571",
        "https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php#L579",
        "https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php#L570",
        "https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php#L571",
        "https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php#L579",
        "https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3543574%40gutenbee&new=3543574%40gutenbee&sfp_email=&sfph_mail=",
        "https://www.wordfence.com/threat-intel/vulnerabilities/id/2d20e8c9-975d-4e8c-8bea-50935853c7d4?source=cve",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9227.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-9227",
        "https://github.com/cssigniter/gutenbee/commit/bde934cdecf67a4de1d6548cc1fc6c59bc6690e5"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-434"
        ],
        "cna_assigner": "Wordfence",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9227.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-9227",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492962,
  "published_at": "2026-05-28T06:45:39.874+00:00"
}