CISA Adds Joomlack Page Builder Vulnerability to KEV List

## Overview CISA has added CVE-2026-56290 to its Known Exploited Vulnerabilities (KEV) list. This vulnerability affects the Joomlack Page Builder extension for Joomla. It allows unauthenticated users to upload arbitrary files, including executable ones. This flaw can lead to full remote code execution (RCE). ## Technical Details The vulnerability stems from improper access control in the Page Builder CK extension. Attackers can exploit this flaw to upload malicious files without authentication. Once the files are uploaded, they can execute arbitrary code on the server. The CVSS score for this vulnerability is 10.0, indicating a critical risk. Evidence of exploitation has prompted CISA to act, urging organizations to address the issue promptly. ## Impact Organizations using Joomlack Page Builder are at significant risk. Successful exploitation can lead to complete system compromise. Attackers can gain control over the affected system, potentially accessing sensitive data or launching further attacks within the network. The implications of such an attack can be severe, affecting both data integrity and availability. ## Mitigation Defenders should immediately update the Joomlack Page Builder extension to the latest version. Regularly monitor systems for unauthorized file uploads. Implement strict access controls to limit who can upload files. Additionally, consider employing web application firewalls to help detect and block exploitation attempts. Organizations must act swiftly to mitigate the risks associated with this critical vulnerability.