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CVE-2026-9227

8.8 · HIGH

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.

Published May 28, 2026CWE-434EPSS 1.23%

Overview

CVE-2026-9227 is a high-severity vulnerability. It was published on May 28, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/cssigniter/gutenbee/commit/bde934cdecf67a4de1d6548cc1fc6c59bc6690e5Refplugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php#L570Refplugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php#L571Refplugins.trac.wordpress.org/browser/gutenbee/tags/2.20.0/gutenbee.php#L579Refplugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php#L570Refplugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php#L571Refplugins.trac.wordpress.org/browser/gutenbee/tags/2.20.1/gutenbee.php#L579Refplugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3543574%40gutenbee&new=3543574%40gutenbee&sfp_email=&sfph_mail=Refwww.wordfence.com/threat-intel/vulnerabilities/id/2d20e8c9-975d-4e8c-8bea-50935853c7d4?source=cve

How CyberStrike helps

Frequently asked questions

What is CVE-2026-9227?

CVE-2026-9227 is a high-severity vulnerability. It was published on May 28, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-9227?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-9227?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-9227?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-9227 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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