Joomlack Page Builder Improper Access Control Vulnerability
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.
MANARTECH SECURITY ALERT
Joomlack Page Builder Improper Access Control Vulnerability
CVE Numbers
CVE-2026-56290
Affected Product
Page Builder — Joomlack
Threat Description
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.
Severity Scale
CRITICALHIGHMEDIUMLOW
Severity
CRITICAL
Affected Versions
To be reviewed
Recommended Mitigation
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.
Reference Links
https://www.joomlack.fr/
https://forum.joomlack.fr/index.php/page-builder-ck/21627-nouvelle-version-de-pbck-et-joomla-3
https://mysites.guru/blog/pagebuilderck-unauthenticated-file-upload-rce/
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56290
https://nvd.nist.gov/vuln/detail/CVE-2026-56290
