CVE-2026-12902

Kadence Blocks <= 3.7.7 - Missing Authorization to Authenticated (Contributor+) Arbitrary Media Attachment Creation via kadence_import_process_pattern/kadence_import_process_data AJAX Actions

2026-06-30 00:00
se1en

Strategic Overview

Status
Patched in 3.7.8
Affected Plugin
Kadence Blocks — Page Builder Toolkit for Gutenberg Editor
Affected Version
<= 3.7.7
CVSS
4.3Medium
Weakness type
CWE-862 · Missing Authorization
CVE
CVE-2026-12902
View all Kadence Blocks — Page Builder Toolkit for Gutenberg Editor vulnerabilities

At a glance

CVE-2026-12902 is a medium-severity Missing Authorization vulnerability in the Kadence Blocks WordPress plugin, affecting versions <= 3.7.7. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Contributor level or above. The issue is fixed in version 3.7.8; sites on affected versions should update now. Disclosed June 2026, reported by se1en.

Vulnerability Overview

The Kadence Blocks — Page Builder Toolkit for Gutenberg Editor plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 3.7.7. 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 create arbitrary Media Library attachments by downloading remote images to the site's uploads directory via wp_upload_bits() and wp_insert_attachment(), bypassing the upload_files capability boundary.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.

CWE-862: Missing Authorization

Kadence Blocks <= 3.7.7 carries this weakness at wp_upload_bits(), and reaching it takes an account at Contributor level or above. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.

Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For Kadence Blocks the fix is 3.7.8: builds <= 3.7.7 are affected, anything from 3.7.8 onward is not.

Remediation

Update to version 3.7.8, or a newer patched version

How does WordSec protect against this?

Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Kadence Blocks 3.7.8 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-12902https://www.wordfence.com/threat-intel/vulnerabilities/id/7de2cb7a-dc3d-41f2-8faa-9e87f78531b5https://nvd.nist.gov/vuln/detail/CVE-2026-12902

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C