CVE record · CVE-2026-56290

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

CVSS 10.0 CriticalCriticalIn CISA KEVEPSS 0.31 · 98th percentile

Critical, because:

In CISA’s KEV catalogue since 7 Jul 2026: it is known to be exploited.
CVSS score 10.0: 9.0 or more.
CVSS score 10.0 (7.0 or more) and EPSS 0.31 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

Published by the CVE Program (CNA: Joomla) at 29 Jun 2026, 14:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
joomlack.fr	JoomlaCK.fr Page Builder CK extension for Joomla	affected 1.0-3.6.0 Other versions: unaffected

Identifiers: CVE-2026-56290
CNA: Joomla
Weakness (CWE): CWE-434
Tags: JoomlaCK.fr Page Builder CK extension for Joomla
Unrestricted file upload
Published: 29 Jun 2026
Updated: 8 Oct 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
10.0	Critical	4.0	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	CNA (Joomla)

CISA KEV Listed since 7 Jul 2026: known to be exploited.
EPSS 0.31, the 98th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 29 Jun 2026. New records show when each source confirmed them.

Sources

References from the CNA

www.joomlack.fr/ product

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.