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

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-9227
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-28 08:16:37 UTC
Updated2026-05-28 13:45:25 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

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

EPSS: 0.001410000 probability, percentile 0.339700000 (date 2026-05-30)

Problem Types: CWE-434 | CWE-434 CWE-434 Unrestricted Upload of File with Dangerous Type

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cssigniterteam GutenBee Gutenberg Blocks affected 2.20.1 semver Not specified

References

ReferenceSourceLinkTags
github.com/cssigniter/gutenbee/commit/bde934cdecf67a4de1d6548cc1fc6c59bc... [email protected] github.com
plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/2d20e8c9-975d-4e8c-8bea-50935... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Athiwat Tiprasaharn (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-05-21T18:47:37.000ZVendor Notified
CNA2026-05-27T18:02:02.000ZDisclosed
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