Missing authorization in extendthemes Kubio AI Page Builder
Key facts
- Attack vector
- Network
- Privileges required
- Low
- 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 AI Page Builder plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 2.8.5. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with contributor-level access and above, to overwrite front-page configuration options (show_on_front, page_on_front, and page_for_posts), rewrite primary navigation menu items, replace template parts, and overwrite the Kubio global-data post. Although a nonce check via check_ajax_referer() is present, the nonce is unconditionally emitted into window.kubioUtilsData for every user who can load the block editor, making it harvestable by any Contributor and therefore an ineffective authorization barrier.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- 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 2.8.5 | — | No fix listed | CNA |
- Kubio AI Page Builder Vendorextendthemes Affected up to 2.8.5 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-16779
- 2026-10-03 Alias added: GHSA-mxh6-wmv3-9hg9
References
Other 6
- https://www.wordfence.com/threat-intel/vulnerabilities/id/febca991-90a0-46b8-9609-2c8a71b5eb5f?source=cve
- https://plugins.trac.wordpress.org/browser/kubio/tags/2.8.5/lib/src/Core/KubioFrontPageRevertNotice.php#L151
- https://plugins.trac.wordpress.org/browser/kubio/tags/2.8.5/lib/src/Core/KubioFrontPageRevertNotice.php#L25
- https://plugins.trac.wordpress.org/browser/kubio/tags/2.8.5/lib/editor-assets.php#L411
- https://plugins.trac.wordpress.org/browser/kubio/tags/2.8.5/lib/kubio-block-library.php#L197
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3633801%40kubio&new=3633801%40kubio
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-2026-16779 · CVE Program
- CVE-2026-16779 · NVD
- FIRST EPSS
- GHSA-mxh6-wmv3-9hg9 · 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