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5.3

Kubio Plugin for WordPress Allows Malicious File Uploads

CVE-2026-5427 · published 6 months ago
Summary

The Kubio plugin for WordPress is vulnerable to a security issue that allows authorized users to upload files from external URLs to the site's media library, potentially leading to malicious content being uploaded. This affects versions of the plugin up to and including 2.7.2. To fix this, update the Kubio plugin to a version higher than 2.7.2 or remove and reinstall it.

Original advisory text
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...
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.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker partial control
Severity
5.3 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-862Missing Authorization
Timeline
Published17 Apr 2026
Updated4 Nov 2026
First seen17 Apr 2026
Sources
CVE-2026-5427 · NVD
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