---
id: CVE-2026-56290
title: >-
  The Joomla extension Page Builder CK is vulnerable to an unauthenticated
  arbitrary file upload that allows uploading executable files and leads to full
  RCE.
summary: >-
  The Joomla extension Page Builder CK is vulnerable to an unauthenticated
  arbitrary file upload that allows uploading executable files and leads to full
  RCE.
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-284
  - CWE-434
vendor: joomlack
product: page_builder_ck
affected:
  - page_builder_ck <= 3.6.0
published: '2026-06-29'
updated: '2026-07-02'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56290'
references:
  - url: 'https://www.joomlack.fr/'
    label: security@joomla.org
  - url: >-
      https://forum.joomlack.fr/index.php/page-builder-ck/21627-nouvelle-version-de-pbck-et-joomla-3
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://mysites.guru/blog/pagebuilderck-unauthenticated-file-upload-rce/'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - kev
  - in-the-wild
  - exploit-available
epss: 0.30866
epssPercentile: 0.98192
ingestedAt: '2026-07-03T13:02:28.091Z'
kev: true
exploited: true
kevDateAdded: '2026-07-07'
kevDueDate: '2026-07-10'
kevRansomware: false
exploitAvailable: true
exploits:
  exploitdb: true
  github: 5
  githubRepos:
    - 'https://github.com/Jenderal92/CVE-2026-56290'
    - 'https://github.com/shinthink/pbck-exploit'
    - 'https://github.com/sagsooz/PageBuilderCK-CVE-2026-56290-Exploit'
  nuclei:
    - CVE-2026-56290
  checkedAt: '2026-09-25T08:21:03.800Z'
---

## Overview

The Joomla extension Page Builder CK is vulnerable to an unauthenticated arbitrary file upload that allows uploading executable files and leads to full RCE.

## Affected

- `page_builder_ck <= 3.6.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.