Critical 10.0Known exploited (CISA KEV)Published Jun 29, 2026

CVE-2026-56290Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0

Updated under an hour ago (2026-10-19 09:00 UTC)

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It affects JoomlaCK.fr Page Builder CK extension for Joomla and 1 other product. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Jul 7, 2026; federal agencies had to remediate by Jul 10, 2026. Treat that date as your deadline.

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Every CVE for JoomlaCK.fr Page Builder CK extension for Joomla

Exploited in the last 30 days

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.

CVSS: 10.0 CRITICAL (v4.0, CNA)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
Weakness (CWE): CWE-434
Known exploited: Added to CISA KEV Jul 7, 2026; federal remediation due Jul 10, 2026Apply 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.
EPSS (exploitation in the next 30 days): 30.87% (percentile 98)
Assigned by: Joomla
NVD analysis: Analyzed
Record last updated: Oct 8, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

joomlack.fr JoomlaCK.fr Page Builder CK extension for Joomla joomlack.fr:page_builder_ck_extension_for_joomla (from the name)	1.0-3.6.0	CNA record
joomlack page_builder_ck joomlack:page_builder_ck	before 3.6.0	NVD

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.