What’s Vulnerable › Vulnerabilities

CVE-2026-56290: Joomlack Page Builder Improper Access Control Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-07-07
• EPSS: 30.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-29 · updated 2026-10-25
• Weakness: CWE-434

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.

Affected products

• JoomlaCK.fr Page Builder CK extension for Joomla: before 3.6.0 — fixed in 3.6.0

How to fix

Upgrade to a fixed version: JoomlaCK.fr Page Builder CK extension for Joomla 3.6.0. Check the vendor advisory for mitigations.

References

• 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

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