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

Wordfence Intelligence > Vulnerability Database > GutenBee <= 2.20.1 - Authenticated (Author+) Arbitrary File Upload via wp_check_filetype_and_ext Filter

8.8

Unrestricted Upload of File with Dangerous Type

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

CVE	CVE-2026-9227
CVSS	8.8 (High)
Publicly Published	May 27, 2026
Last Updated	May 28, 2026
Researcher	Athiwat Tiprasaharn (Jitlada)

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.

Learn more about Arbitrary File Upload vulnerabilities and how to prevent them.

References

Vulnerability Details for GutenBee – Gutenberg Blocks

GutenBee – Gutenberg Blocks

Software Type	Plugin
Software Slug	gutenbee (view on wordpress.org)
Patched?	Yes
Remediation	Update to version 2.20.2, or a newer patched version
Affected Version	<= 2.20.1
Patched Version	2.20.2

Recent vulnerabilities in GutenBee – Gutenberg Blocks

GutenBee – Gutenberg Blocks <= 2.18.0 - Authenticated (Contributor+) Stored Cross-Site Scripting

6.4

CVE-2025-8566

Sep 29, 2025

Researcher: zer0gh0st

#	Title	CVE ID	CVSS	Researchers	Date
1	GutenBee – Gutenberg Blocks <= 2.18.0 - Authenticated (Contributor+) Stored Cross-Site Scripting	CVE-2025-8566	6.4	zer0gh0st	September 29, 2025

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