CVE-2026-2826

Kadence Blocks — Page Builder Toolkit for Gutenberg Editor <= 3.6.3 - Missing Authorization to Authenticated (Contributor+) Media Upload

2026-04-03 19:45
lucsob

Strategic Overview

Status
Patched in 3.6.4
Affected Plugin
Kadence Blocks — Page Builder Toolkit for Gutenberg Editor
Affected Version
<= 3.6.3
CVSS
4.3Medium
Weakness type
CWE-862 · Missing Authorization
CVE
CVE-2026-2826
View all Kadence Blocks — Page Builder Toolkit for Gutenberg Editor vulnerabilities

At a glance

CVE-2026-2826 is a medium-severity Missing Authorization vulnerability in the Kadence Blocks WordPress plugin, affecting versions <= 3.6.3. 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 3.6.4; sites on affected versions should update now. Disclosed April 2026, reported by lucsob.

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, 3.6.3. This is due to the plugin not properly verifying that a user has the `upload_files` capability in the `process_pattern` REST API endpoint. This makes it possible for authenticated attackers, with contributor level access and above, to upload images to the WordPress Media Library by supplying remote image URLs that the server downloads and creates as media attachments.

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

Reaching this weakness in Kadence Blocks <= 3.6.3 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 3.6.4: builds <= 3.6.3 are affected, anything from 3.6.4 onward is not.

Remediation

Update to version 3.6.4, 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 3.6.4 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-2826https://www.wordfence.com/threat-intel/vulnerabilities/id/5f91df7e-5d9d-4a3a-9afc-d771106a0be6https://nvd.nist.gov/vuln/detail/CVE-2026-2826

Related records

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