CVE WatchOct 7, 2026

CVE-2026-56290

Joomlack Page Builder Improper Access Control Vulnerability

CVSS

9.8

Critical

EPSS

30.9%

p98

KEV

YES

Jul 7, 2026

Exploit Today

0-100

Published: Jun 29, 2026 · Last modified: Oct 7, 2026 · CWE-434

EPSS · 30d

30.9%EPSS · 30 days30.9%

2026-09-182026-10-15

KEV catalog record

Product

Joomlack / Page Builder

Vulnerability

Joomlack Page Builder Improper Access Control Vulnerability

Added to KEV

Jul 7, 2026

Remediate by

Jul 10, 2026

Known ransomware use

Summary description

Joomlack Page Builder contains an improper access control vulnerability that could allow for remote code execution via unauthenticated arbitrary file upload.

Required action

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.

Notes

https://www.joomlack.fr/en/joomla-extensions/page-builder-ck ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-56290

Technical 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.

Official references

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CVE-2026-1113118.8 HIG

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