What the vulnerability does
01Description
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.
Explanation of Vulnerability in Simple Terms
02Summary
The JoomlaCK.fr Page Builder CK extension for Joomla contains an access control flaw that allows unauthenticated attackers to perform unauthorized actions over the network. The vulnerability affects versions 1.0-3.6.0 and earlier. No patch information is currently available. Site administrators should monitor for updates from the vendor.
What an attacker can do
03Attacker Capabilities
Perform unauthorized actions on the Joomla site without authentication.
Potential impact on your site
04Site Impact
Attackers can modify or access sensitive site data and functionality without logging in.
Conditions required to exploit
05Prerequisites
Network access only; no authentication or user interaction required.
CISA mandated remediation
06CISA Required Action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Key dates
07Disclosure timeline
June 29, 2026
CVE published
July 23, 2026
Record updated