Summary
generated automatically from NVD dataPage Builder CK, a Joomla extension from joomlack.fr, contains an unauthenticated arbitrary file upload flaw (CWE-434) in versions before 3.6.0. A remote attacker can upload executable files without logging in, which leads to full remote code execution on the server. The issue is rated CRITICAL with a CVSS v3.1 score of 9.8, and CISA lists it in its KEV catalog as actively exploited.
NVD 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.
⚠️ Actively exploited — CISA KEV
This CVE was added to CISA's Known Exploited Vulnerabilities catalog on 2026-07-07. It is confirmed exploited in the wild and must be patched as a priority.
Remediation deadline (US federal agencies): 2026-07-10
EPSS · FIRST.org
30.9%probability of exploitation in the next 30 days
Higher than 98% of scored CVEs
EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-16, recomputed daily by FIRST.org.
In-depth analysis on cveo.tech
We've published a detailed analysis of this CVE — exploitation, IOCs and mitigation.
CVSS v3.1 Score
Information
- Published
- 29 juin 2026
- Updated
- 7 oct. 2026
- Status
- Analyzed
- Source
- security@joomla.org
Affected products
Weaknesses (CWE)
References (4)
- https://www.joomlack.fr/Product
- https://mysites.guru/blog/pagebuilderck-unauthenticated-file-upload-rce/ExploitThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56290US Government Resource
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