CVE-2026-56290 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-56290CRITICAL

joomlack.fr JoomlaCK.fr Page Builder CK extension for Joomla — Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   N   H   H   H   10.0   .8325   99.7   YES

AFFECTED
  Product                                           Versions     Fixed
  JoomlaCK.fr Page Builder CK extension for Joomla  1.0-3.6.0 –  —

TIMELINE
  Jun 20  Reserved by Joomla
  Jul 7   EXPLOIT PUBLISHED — CVE-2026-56290 (JoomlaCK.fr Page Builder CK extension for Joomla). Public exploit reference added.
  Jul 7   Added to CISA KEV, remediation due 2026-07-10
  Jul 7   Published (CNA: Joomla)
  Jul 11  DUE DATE PASSED — CVE-2026-56290 (JoomlaCK.fr Page Builder CK extension for Joomla). CISA remediation deadline was July 10, 2026; still in catalog.
  Jul 24  EXPLOIT PUBLISHED — CVE-2026-56290 (JoomlaCK.fr Page Builder CK extension for Joomla). Public exploit reference added.

CWE-434 · CNA: Joomla · CVSS v4.0 · 4 references · NVD status: Analyzed · KEV due July 10, 2026

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.

Lifecycle

Complete event history — 6 events, chronological
Date	Event	Detail
June 20, 2026	Reserved	Reserved by Joomla
July 7, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-56290 (JoomlaCK.fr Page Builder CK extension for Joomla). Public exploit reference added.
July 7, 2026	KEV ADDED	Added to CISA KEV, remediation due 2026-07-10
July 7, 2026	Published	Published (CNA: Joomla)
July 11, 2026	DUE DATE PASSED	DUE DATE PASSED — CVE-2026-56290 (JoomlaCK.fr Page Builder CK extension for Joomla). CISA remediation deadline was July 10, 2026; still in catalog.
July 24, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-56290 (JoomlaCK.fr Page Builder CK extension for Joomla). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
joomlack.fr	JoomlaCK.fr Page Builder CK extension for Joomla	—	1.0-3.6.0	—

Weaknesses

CWE-434

References (4)

https://forum.joomlack.fr/index.php/page-builder-ck/21627-nouvelle-version-de-pbck-et-joomla-3 [Issue Tracking, Patch]
https://mysites.guru/blog/pagebuilderck-unauthenticated-file-upload-rce/ [Exploit, Third Party Advisory]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56290 [US Government Resource]
https://www.joomlack.fr/ [Product]

Authoritative record: CVE-2026-56290 at cve.org

Vendors: joomlack.fr

Weaknesses: CWE-434

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-56290 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.