CVE-2026-56290: CWE-434: Unrestricted Upload of File with Dangerous Type in joomlack.fr JoomlaCK.fr Page Builder CK extension for Joomla
The JoomlaCK.fr Page Builder CK extension for Joomla versions 1.0 through 3.6.0 contains a critical vulnerability allowing unauthenticated attackers to upload arbitrary executable files. This unrestricted file upload leads to full remote code execution (RCE) on affected systems. The vulnerability is identified as CWE-434 and carries a CVSS 4.0 base score of 10. No official patch or remediation guidance is currently provided by the vendor.
AI Analysis
Technical Summary
CVE-2026-56290 is a critical vulnerability in the JoomlaCK.fr Page Builder CK extension for Joomla, affecting versions 1.0 up to and including 3.6.0. It allows unauthenticated attackers to upload files of dangerous types without restriction, enabling arbitrary file upload. This flaw leads to full remote code execution on the target system. The vulnerability is classified under CWE-434 (Unrestricted Upload of File with Dangerous Type) and has a CVSS 4.0 score of 10, indicating maximum severity. No vendor advisory or patch information is currently available, and no known exploits in the wild have been reported.
Potential Impact
Successful exploitation allows unauthenticated attackers to upload executable files, resulting in full remote code execution on affected Joomla installations using the vulnerable Page Builder CK extension. This can lead to complete system compromise, data breach, or further malicious activity.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to the vulnerable extension, disable file uploads if possible, and monitor for suspicious activity related to file uploads.
CVE-2026-56290: CWE-434: Unrestricted Upload of File with Dangerous Type in joomlack.fr JoomlaCK.fr Page Builder CK extension for Joomla
Description
The JoomlaCK.fr Page Builder CK extension for Joomla versions 1.0 through 3.6.0 contains a critical vulnerability allowing unauthenticated attackers to upload arbitrary executable files. This unrestricted file upload leads to full remote code execution (RCE) on affected systems. The vulnerability is identified as CWE-434 and carries a CVSS 4.0 base score of 10. No official patch or remediation guidance is currently provided by the vendor.
CVSS v4.0
Score 10.0critical
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-56290 is a critical vulnerability in the JoomlaCK.fr Page Builder CK extension for Joomla, affecting versions 1.0 up to and including 3.6.0. It allows unauthenticated attackers to upload files of dangerous types without restriction, enabling arbitrary file upload. This flaw leads to full remote code execution on the target system. The vulnerability is classified under CWE-434 (Unrestricted Upload of File with Dangerous Type) and has a CVSS 4.0 score of 10, indicating maximum severity. No vendor advisory or patch information is currently available, and no known exploits in the wild have been reported.
Potential Impact
Successful exploitation allows unauthenticated attackers to upload executable files, resulting in full remote code execution on affected Joomla installations using the vulnerable Page Builder CK extension. This can lead to complete system compromise, data breach, or further malicious activity.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to the vulnerable extension, disable file uploads if possible, and monitor for suspicious activity related to file uploads.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Joomla
- Date Reserved
- 2026-06-20T11:57:32.752Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a42868727e9c7971906ce1e
Added to database: 06/29/2026, 14:51:51 UTC
Last enriched: 08/12/2026, 16:35:46 UTC
Last updated: 08/13/2026, 00:41:13 UTC
Views: 289
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