Missing authorization in extendthemes Kubio AI Page Builder
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| extendthemes | Kubio AI Page Builder | up to 2.7.2 | — | No fix listed | CNA |
- Kubio AI Page Builder Vendorextendthemes Affected up to 2.7.2 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-5427
- 2026-10-03 Alias added: GHSA-69wp-qf6q-mf28
References
Other 8
- https://www.wordfence.com/threat-intel/vulnerabilities/id/d8096f3c-e1a9-424f-af10-3e80212db985?source=cve
- https://plugins.trac.wordpress.org/browser/kubio/trunk/lib/src/Core/Importer.php#L546
- https://plugins.trac.wordpress.org/browser/kubio/tags/2.7.1/lib/src/Core/Importer.php#L546
- https://plugins.trac.wordpress.org/browser/kubio/trunk/lib/importer/importer-filters/kubio-blocks.php#L20
- https://plugins.trac.wordpress.org/browser/kubio/tags/2.7.1/lib/importer/importer-filters/kubio-blocks.php#L20
- https://plugins.trac.wordpress.org/browser/kubio/trunk/lib/filters/post-insert.php#L17
- https://plugins.trac.wordpress.org/browser/kubio/tags/2.7.1/lib/filters/post-insert.php#L17
- https://plugins.trac.wordpress.org/changeset/3506647/kubio/trunk/lib/src/Core/Importer.php
More extendthemes vulnerabilities
- TI-2025-02014 Kubio AI Page Builder <= 2.5.1 - Unauthenticated Local File Inclusion CVSS 3.1CRITICAL 9.8
- TI-2022-04358 Materialis Companion < 1.3.40 - Contributor+ Stored XSS via Shortcode CVSS 3.1MEDIUM 5.4
- TI-2022-04096 Mesmerize Companion < 1.6.135 - Contributor+ Stored XSS CVSS 3.1MEDIUM 5.4
- TI-2019-15245 Mesmerize <= 1.6.89 & Materialis <= 1.0.172 - Authenticated Arbitrary Options Update CVSS 3.1HIGH 8.8
- TI-2026-54440 WordPress Lead Generation Contact Widget & AI Chatbot: Chat Button, Phone Call, Telegram… CVSS 3.1HIGH 7.5
- TI-2024-22269 WordPress Teluro theme <= 1.0.31 - Cross Site Request Forgery (CSRF) vulnerability CVSS 3.1HIGH 8.8
Sources
- CVE-2026-5427 · CVE Program
- CVE-2026-5427 · NVD
- FIRST EPSS
- GHSA-69wp-qf6q-mf28 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences