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CVE-2026-56290

Joomlack Page Builder Improper Access Control

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 30.9%
  1. Published29 Jun 2026
  2. Added to CISA KEV7 Jul 2026
  3. Remediation due10 Jul 2026
Actively exploited (CISA KEV)

Joomlack Page Builder contains an improper access control vulnerability that could allow for remote code execution via unauthenticated arbitrary file upload.

Added to KEV: 7 Jul 2026Federal remediation due: 10 Jul 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Joomlack Page Builder Ck< 3.6.0

Remediation

Fixed in
Joomlack Page Builder Ck≥ 3.6.0

References

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Frequently asked

Is CVE-2026-56290 being actively exploited?

Yes. CVE-2026-56290 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 7 Jul 2026.

How severe is CVE-2026-56290?

CVE-2026-56290 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 30.9% probability of exploitation.

Which products are affected by CVE-2026-56290?

Affected products include Joomlack Page Builder Ck.

How do I fix CVE-2026-56290?

Upgrade affected software to a fixed version, for example Joomlack Page Builder Ck 3.6.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-56290 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.