CVE-2026-5427 MEDIUM

CVE-2026-5427: Kubio AI Page Builder <= 2.7.2 - Missing Authorization to Authenticated (Contributor+) Limited File Upload via Kubio Block Attributes

Vendor Extendthemes
Product Kubio AI Page Builder
Weakness CWE-862 · Missing authorization
Published April 17, 2026
Last update April 17, 2026
View on NVD All CVEs

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

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.

Explanation of Vulnerability in Simple Terms

02Summary

Kubio AI Page Builder versions up to 2.7.2 lack proper authorization checks, allowing unauthenticated attackers to modify site content. The vulnerability requires no user interaction and can be exploited over the network. Site administrators should update to a version newer than 2.7.2 to prevent unauthorized changes to pages and posts.

What an attacker can do

03Attacker Capabilities

Modify site content without logging in.

Potential impact on your site

04Site Impact

Attackers can alter pages, posts, or other content without your knowledge or permission.

Conditions required to exploit

05Prerequisites

Network access only; no authentication or user interaction required.

Key dates

06Disclosure timeline

April 17, 2026 CVE published
April 17, 2026 Record updated