cssigniterteam GutenBee Plugin up to 2.20.1 on WordPress json gutenbee_file_and_ext_json unrestricted upload

Summaryinfo

A vulnerability was found in cssigniterteam GutenBee Plugin up to 2.20.1 on WordPress and classified as critical. This affects the function gutenbee_file_and_ext_json of the file json. The manipulation results in unrestricted upload. This vulnerability is cataloged as CVE-2026-9227. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in cssigniterteam GutenBee Plugin up to 2.20.1 on WordPress. It has been classified as critical. Affected is the function gutenbee_file_and_ext_json of the file json. The manipulation with an unknown input leads to a unrestricted upload vulnerability. CWE is classifying the issue as CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was shared by Athiwat Tiprasaharn. The advisory is available at wordfence.com. This vulnerability is traded as CVE-2026-9227 since 05/21/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 05/28/2026). This vulnerability is assigned to T1608.002 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• WordPress Plugin

Vendor

• cssigniterteam

Name

• GutenBee Plugin

Version

• 2.20.0
• 2.20.1

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

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• 🔒

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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