Joomlack · Page Builder
CVE-2026-56290
Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0
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.
CISA: Joomlack Page Builder contains an improper access control vulnerability that could allow for remote code execution via unauthenticated arbitrary file upload.
What 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 evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Deadline for US federal agencies: July 10, 2026
- Added to the CISA list
- July 7, 2026
- Published
- June 29, 2026
- Severity
- Critical 10.0 CVSS 4.0
- Chance of attacks in the next 30 days (EPSS)
- 31% in the top 1.8% of all known vulnerabilities
- Weakness
- CWE-284
- More details
- NVD · CVE.org · CISA
All references (1)
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.