CVE-2026-48939: critical vulnerability in icagenda.com iCagenda extension for Joomla
Joomla Extension - icagenda.com - Remote Code Execution in iCaganda extension for Joomla < 4.0.8/3.9.15
Published · Updated
Patch now. It under exploitation confirmed by CISA and has a working public exploit.
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.
The iCagenda extension for Joomla allows attackers to upload malicious PHP files through the file attachment feature, giving them complete control over the website. This is critical because it lets anyone execute arbitrary code on the server.
CWE-434 Unrestricted File Upload vulnerability in iCagenda extension versions before 4.0.8/3.9.15. The file attachment feature lacks proper validation of uploaded file types, allowing unauthenticated or low-privileged attackers to upload PHP files and achieve remote code execution with server privileges.
The full analysis of this CVE is available in Portuguese →
In the same product, most dangerous first.