WordPress security changelog
MEDIUM CVE-2026-16779 Deferred

Kubio block-editor nonce permits Contributor site-configuration takeover

Kubio AI Page Builder through 2.8.5 exposes an affected nonce to every user who can open the block editor. A Contributor can use that nonce to invoke insufficiently authorized Kubio operations that overwrite show_on_front, page_on_front, page_for_posts, navigation-menu assignments, template parts, and the Kubio global-data post.

CVE / CNA score 4.3 CVSS 3.1 · security@wordfence.com
NVD score Pending NVD has not published its own CVSS assessment.
Component
Kubio AI Page Builder
Plugin slug
kubio
Affected
<= 2.8.5
Safe version
See mitigation notes
Published
Aug 16, 2026
Weakness
CWE-862 — Missing Authorization

This CVE was published Aug 16, 2026 and is one of 11 known issues for this plugin.

What to do

Update, patch or deactivate.

This archive could not verify a fixed version from the official author release notes reviewed on 2026-10-13. Disable the affected feature or component where practical until remediation for the deployed configuration is established. restrict Contributor access to Kubio and the block editor, and audit front-page, posts-page, menu, template-part, and Kubio global-data changes. Official author release notes: https://wordpress.org/plugins/kubio/#developers.

No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical description

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.

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

References

Primary and upstream sources