CVE-2026-56290

critical

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.

References

Exploits
More

https://www.securityweek.com/cisa-urges-immediate-patching-of-exploited-coldfusion-langflow-joomla-flaws/

https://thehackernews.com/2026/07/cisa-adds-4-actively-exploited-adobe.html

https://securityaffairs.com/194927/hacking/u-s-cisa-adds-adobe-coldfusion-joomlack-page-builder-langflow-and-joomshaper-sp-page-builder-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://www.cisa.gov/news-events/alerts/2026/07/07/cisa-adds-three-known-exploited-vulnerabilities-catalog

https://github.com/katranSefa/CVE-2026-56290

https://github.com/Jenderal92/CVE-2026-56290

https://github.com/HORKimhab/poc-cve-collection

https://www.joomlack.fr/

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56290

https://forum.joomlack.fr/index.php/page-builder-ck/21627-nouvelle-version-de-pbck-et-joomla-3

Details

Source: Mitre, NVD

Published: 2026-06-29

Updated: 2026-07-24

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

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

Severity: Critical

CVSS v4

Base Score: 10

Vector: 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

Severity: Critical

EPSS

EPSS: 0.30866