---
id: CVE-2026-56290
title: >-
  Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder
  CK extension < 3.6.0 - The Joomla extension Page Builder CK is vulnerable to
  an unauthenticated arbitrary file upload that allows uploading executable
  files and…
summary: >-
  Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder
  CK extension < 3.6.0 - The Joomla extension Page Builder CK is vulnerable to
  an unauthenticated arbitrary file upload that allows uploading executable
  files and…
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-434
vendor: joomlack
product: page_builder_ck
affected:
  - page_builder_ck < 3.6.0
patched:
  - page_builder_ck 3.6.0
published: '2026-06-29'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T19:17:38.810'
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
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56290
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - kev
  - in-the-wild
  - exploit-available
  - cve.org
epss: 0.30866
epssPercentile: 0.98242
kev: true
kevDateAdded: '2026-07-07'
kevDueDate: '2026-07-10'
kevRansomware: false
exploited: 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: '2026-10-27T19:04:38.615Z'
exploitAvailable: true
ssvc:
  exploitation: active
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-07-08T03:56:32.575114Z'
scores:
  nvd: 9.8
  cna: 10
ingestedAt: '2026-07-03T13:02:28.091Z'
---

## Overview

Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0 - 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

Upgrade past the affected range:

- `page_builder_ck 3.6.0`