CVE-2026-56290

EUVD-2026-40121
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 99.65%
Affected Products (NVD)
VendorProductVersion
joomlackpage_builder_ck
𝑥
< 3.6.0
𝑥
= Vulnerable software versions
Common Weakness Enumeration
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