CVE-2026-56290

CriticalCVSS 9.8/10Known exploited (CISA KEV)Last modified Oct 25, 2026

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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-434

Affected software

Vendor	Product	Versions
joomlack.fr	JoomlaCK.fr Page Builder CK extension for Joomla	1.0-3.6.0

References

https://www.joomlack.fr/Product
https://forum.joomlack.fr/index.php/page-builder-ck/21627-nouvelle-version-de-pbck-et-joomla-3Issue Tracking, Patch
https://mysites.guru/blog/pagebuilderck-unauthenticated-file-upload-rce/Exploit, Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56290US Government Resource

Timeline

Published: Jun 29, 2026
Last modified: Oct 25, 2026
Added to CISA KEV: Jul 7, 2026
NVD status: Analyzed

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