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CVE-2026-56290— Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0

Quick assessment

Affected
joomlack.fr JoomlaCK.fr Page Builder CK extension for Joomla
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Joomla! Page Builder CK是Joomla!组织的一款Joomla CMS页面构建组件。 Joomla! Page Builder CK 1.0版本至3.6.0版本存在权限许可和访问控制问题漏洞，该漏洞源于访问控制不当，可能导致未经身份验证的攻击者上传任意可执行文件并实现远程代码执行。

CVSS 10.0 · Critical KEV EPSS 30.87% · P98

Public Exploits 2

ExploitDB · 1 EDB-52626 [webapps]
Nuclei · 1 CVE-2026-56290.yaml [template]

Affected Version Matrix 1

VendorProduct Version RangeStatus
joomlack.fr JoomlaCK.fr Page Builder CK extension for Joomla 1.0-3.6.0 affected
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I. Basic Information for CVE-2026-56290

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Joomla Extension - joomlack.fr - Unauthenticated file upload in Page Builder CK extension < 3.6.0
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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/AU:Y/U:Red
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
Joomla! Page Builder CK 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Joomla! Page Builder CK是Joomla!组织的一款Joomla CMS页面构建组件。 Joomla! Page Builder CK 1.0版本至3.6.0版本存在权限许可和访问控制问题漏洞，该漏洞源于访问控制不当，可能导致未经身份验证的攻击者上传任意可执行文件并实现远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
joomlack.fr JoomlaCK.fr Page Builder CK extension for Joomla 1.0-3.6.0 -

II. Public POCs for CVE-2026-56290

# POC Description Source Link Shenlong Link
1 Joomla Page Builder CK contains an unrestricted file upload vulnerability caused by lack of proper validation, letting unauthenticated attackers upload executable files and achieve remote code execution. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-56290.yaml POC Details
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default-local-qwen3.6 · 11537 chars
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III. Intelligence Information for CVE-2026-56290

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Security Blog Posts for CVE-2026-56290 (1)

IV. Related Vulnerabilities

Same vendor: joomlack.fr
Same weakness: CWE-434

V. Comments for CVE-2026-56290

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