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Known exploited vulnerability

CVE-2026-56290

criticalCVSS 4.0 10.0In CISA KEVEPSS 31%Published · joomlack.fr

The short answer

CVE-2026-56290 affects joomlack.fr JoomlaCK.fr Page Builder CK extension for Joomla and is rated critical (CVSS 10.0). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-07-07: attackers are using it, so patch it first. The vendor has linked a patch.

What it is

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.

Weakness: CWE-434.

Severity

10.0 critical

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:X/RE:X/U:Red

Exploited (CISA KEV)

Yes, since Jul 7, 2026

Federal due date Jul 10, 2026

EPSS, next 30 days

31%

Higher than 98% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Attack requirements
None
Privileges required
None
User interaction
None
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

Apply 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…

Affected products

JoomlaCK.fr Page Builder CK extension for Joomla. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-56290 being exploited?

Yes. CISA added CVE-2026-56290 to its Known Exploited Vulnerabilities catalog on 2026-07-07, with a federal remediation due date of 2026-07-10.

How do I fix CVE-2026-56290?

CISA's required action: Apply 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…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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