CVE-2026-56290 PUBLISHED

Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0

Assigner: Joomla
Reserved: 20.06.2026 Published: 29.06.2026 Updated: 29.06.2026

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 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/AU:Y/U:Red
CVSS Score: 10

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	None	Availability	High	Availability	High
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	joomlack.fr
Product	JoomlaCK.fr Page Builder CK extension for Joomla
Versions	Default: unaffected Version 1.0-3.6.0 is affected

Credits

Phil Taylor finder

References

https://www.joomlack.fr/

Problem Types

CWE-284 Improper Access Control CWE

Impacts

CAPEC-242: Code Injection