# CVE-2026-56290

## Summary

- **CVE ID:** CVE-2026-56290
- **Severity:** CRITICAL
- **CVSS Score:** 10 (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)
- **CWE:** CWE-284, CWE-434
- **Published:** Jun 29, 2026
- **Last Modified:** Aug 12, 2026

## Description

The Joomla extension Page Builder CK is vulnerable to an unauthenticated arbitrary file upload that allows uploading executable files and leads to full RCE.

## Affected Products

- joomlack.fr — JoomlaCK.fr Page Builder CK extension for Joomla (1.0-3.6.0)

## References

- [CNA](https://www.joomlack.fr/)
- [CISA-ADP](https://mysites.guru/blog/pagebuilderck-unauthenticated-file-upload-rce/)
- [CISA-ADP](https://forum.joomlack.fr/index.php/page-builder-ck/21627-nouvelle-version-de-pbck-et-joomla-3)
- [CISA-ADP](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56290)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 30.38%
- **EPSS Percentile:** 98.1

## Known Exploited Vulnerabilities (KEV)

- **Date Added:** Jul 7, 2026
- **Due Date:** Jul 10, 2026

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._