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

> CVE-2026-56290: Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2026-56290
Last updated: 2026-10-25T21:10:00Z

- Published: 2026-06-29 14:31 UTC · Updated: 2026-10-25 21:10 UTC · Assigner: Joomla
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 30.9%, 98th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2026-07-07, federal due date 2026-07-10, ransomware use: Unknown
- CWE: CWE-434

## 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.

## CISA 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 evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

## Affected vendors and products

- joomlack.fr: JoomlaCK.fr Page Builder CK extension for Joomla

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-56290)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-56290)
- [https://www.joomlack.fr/](https://www.joomlack.fr/)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-56290 · Markdown: https://rewindex.com/cve/CVE-2026-56290.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-56290 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:10:47.739Z