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CVE-2026-5427

5.3 · MEDIUM

The Kubio plugin for WordPress is vulnerable to Arbitrary File Upload in versions up to and including 2.7.2.

Published Apr 17, 2026CWE-862EPSS 0.47%

Overview

CVE-2026-5427 is a medium-severity vulnerability. It was published on April 17, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The Kubio plugin for WordPress is vulnerable to Arbitrary File Upload in versions up to and including 2.7.2. This is due to insufficient capability checks in the kubio_rest_pre_insert_import_assets() function, which is hooked to the rest_pre_insert_{post_type} filter for posts, pages, templates, and template parts. When a post is created or updated via the REST API, Kubio parses block attributes looking for URLs in the 'kubio' attribute namespace and automatically imports them via importRemoteFile() without verifying the user has the upload_files capability. This makes it possible for authenticated attackers with Contributor-level access and above to bypass WordPress's normal media upload restrictions and upload files fetched from external URLs to the media library, creating attachment posts in the database.

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

Refplugins.trac.wordpress.org/browser/kubio/tags/2.7.1/lib/filters/post-insert.php#L17Refplugins.trac.wordpress.org/browser/kubio/tags/2.7.1/lib/importer/importer-filters/kubio-blocks.php#L20Refplugins.trac.wordpress.org/browser/kubio/tags/2.7.1/lib/src/Core/Importer.php#L546Refplugins.trac.wordpress.org/browser/kubio/trunk/lib/filters/post-insert.php#L17Refplugins.trac.wordpress.org/browser/kubio/trunk/lib/importer/importer-filters/kubio-blocks.php#L20Refplugins.trac.wordpress.org/browser/kubio/trunk/lib/src/Core/Importer.php#L546Refplugins.trac.wordpress.org/changeset/3506647/kubio/trunk/lib/src/Core/Importer.phpRefwww.wordfence.com/threat-intel/vulnerabilities/id/d8096f3c-e1a9-424f-af10-3e80212db985?source=cve

How CyberStrike helps

Frequently asked questions

What is CVE-2026-5427?

CVE-2026-5427 is a medium-severity vulnerability. It was published on April 17, 2026 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-5427?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-5427?

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-2026-5427?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-5427 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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