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.

CVSS 4.0

10.0CVSS: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

CVSS 3.1

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

31% chance of exploitation in the next 30 days; higher than 98% of CVEs (scores of 2026-10-25)

CISA KEV

listed 2026-07-07, due 2026-07-10

CWE

CWE-434

Published

2026-06-29

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

Affected

• joomlack:page_builder_ck

References

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

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