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CVE-2026-9227— GutenBee <= 2.20.1 - Authenticated (Author+) Arbitrary File Upload via wp_check_filetype_and_ext Filter

Quick assessment

Affected
cssigniterteam GutenBee – Gutenberg Blocks
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin GutenBee – Gutenberg Blocks 2.20.1及之前版本存在代码问题漏洞，该漏洞源于gutenbee_file_and_ext_json函数存在任意文件上传问题，因为使用了有缺陷的strpos子

CVSS 8.8 · High EPSS 1.23% · P68

Affected Version Matrix 1

VendorProduct Version RangeStatus
cssigniterteam GutenBee – Gutenberg Blocks ≤ 2.20.1 affected
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I. Basic Information for CVE-2026-9227

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
GutenBee <= 2.20.1 - Authenticated (Author+) Arbitrary File Upload via wp_check_filetype_and_ext Filter
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress plugin GutenBee – Gutenberg Blocks 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin GutenBee – Gutenberg Blocks 2.20.1及之前版本存在代码问题漏洞，该漏洞源于gutenbee_file_and_ext_json函数存在任意文件上传问题，因为使用了有缺陷的strpos子
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
cssigniterteam GutenBee – Gutenberg Blocks 0 ~ 2.20.1 -

II. Public POCs for CVE-2026-9227

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8197 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-9227

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Patches & Fixes for CVE-2026-9227 (7)

Vendor Advisories for CVE-2026-9227 (1)

Other References for CVE-2026-9227 (1)

IV. Related Vulnerabilities

Same product: GutenBee – Gutenberg Blocks
Same vendor: cssigniterteam
Same weakness: CWE-434

V. Comments for CVE-2026-9227

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