- Critical 10.0
- Known exploited (CISA KEV)
CVE-2026-56290
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.
Scores
The facts
- Published
- 29 June 2026
- Last changed
- 7 October 2026
- NVD status
- Analyzed
- Severity
- Critical, CVSS 10.0 out of 10 (version 4.0)
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… - Weakness
- Affects
- joomlack page builder ck
- Known exploited
- Yes. CISA added it to the Known Exploited Vulnerabilities catalogue on 7 July 2026.
- EPSS
- 30.9% chance of exploitation activity in the next 30 days (percentile 98).
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