{"id":"CVE-2026-9227","aliases":["EUVD-2026-32732","GHSA-fxjg-wrwj-m45j"],"status":"published","title":"GutenBee \u003c= 2.20.1 - Authenticated (Author+) Arbitrary File Upload via wp_check_filetype_and_ext Filter","description":"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":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00684,"percentile":0.52826,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-434"],"published":"2026-05-28T06:45:39Z","modified":"2026-10-28T02:30:26Z","products":[{"vendor":"cssigniterteam","product":"gutenbee – gutenberg blocks"}],"references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/2d20e8c9-975d-4e8c-8bea-50935853c7d4?source=cve","tags":["web"]},{"url":"https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php#L571","tags":["web"]},{"url":"https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php#L570","tags":["web"]},{"url":"https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php#L579","tags":["web"]},{"url":"https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php#L571","tags":["web"]},{"url":"https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php#L570","tags":["web"]},{"url":"https://plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php#L579","tags":["web"]},{"url":"https://github.com/cssigniter/gutenbee/commit/bde934cdecf67a4de1d6548cc1fc6c59bc6690e5","tags":["fix"]},{"url":"https://plugins.trac.wordpress.org/changeset?sfp_email=\u0026sfph_mail=\u0026reponame=\u0026old=3543574%40gutenbee\u0026new=3543574%40gutenbee\u0026sfp_email=\u0026sfph_mail=","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-9227","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-fxjg-wrwj-m45j"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9227.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-9227","title":"GutenBee \u003c= 2.20.1 - Authenticated (Author+) Arbitrary File Upload via wp_check_filetype_and_ext Filter","description":"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.","status":"published","published":"2026-05-28T06:45:39.874Z","modified":"2026-05-28T10:35:06.797Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-434"],"updated_at":"2026-11-02T13:42:37.965383Z"}],"euvd":[{"id":"EUVD-2026-32732","description":"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.","status":"published","published":"2026-05-28T06:45:39Z","modified":"2026-05-28T10:35:06Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T18:21:03.0662Z"}],"ghsa":[{"id":"GHSA-fxjg-wrwj-m45j","title":"The GutenBee – Gutenberg Blocks plugin for WordPress is vulnerable to Arbitrary File Upload in...","description":"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.","status":"published","published":"2026-05-28T09:31:19Z","modified":"2026-05-28T09:31:27Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-434"],"updated_at":"2026-11-02T15:08:21.544183Z"}],"nvd":[{"id":"CVE-2026-9227","description":"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.","status":"published","published":"2026-05-28T08:16:37.713Z","modified":"2026-06-17T11:04:56.707Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-434"],"updated_at":"2026-11-02T14:12:20.885865Z"}],"osv":[{"id":"CVE-2026-9227","title":"GutenBee \u003c= 2.20.1 - Authenticated (Author+) Arbitrary File Upload via wp_check_filetype_and_ext Filter","description":"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.","status":"published","published":"2026-05-28T06:45:39.874Z","modified":"2026-10-28T02:30:26.501966973Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-434"],"updated_at":"2026-11-02T15:45:20.269367Z"}]}}