CVE-2026-48939 icagenda.com CVE debrief

Who should care

Administrators and security teams responsible for Joomla installations with the iCagenda extension should prioritize assessing and mitigating this vulnerability. Given the critical severity and potential for arbitrary code execution, immediate attention is necessary to prevent exploitation.

Technical summary

The iCagenda extension for Joomla is vulnerable to arbitrary file upload in its file attachment feature. This allows attackers to upload PHP code, which can then be executed on the server. The vulnerability has been assigned a CVSS score of 10, indicating the highest level of severity. The CVSS vector is 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:X/RE:X/U:Red, reflecting a scenario where an attacker can exploit the vulnerability remotely with low attack complexity.

Defensive priority

High priority due to critical severity and potential for code execution

Recommended defensive actions

• Inventory Joomla installations with the iCagenda extension to assess exposure
• Review official advisories and vendor documentation for mitigation guidance
• Apply vendor-supported remediation or patches as available
• Implement compensating controls to limit exposure, such as restricting file uploads or monitoring for suspicious activity
• Track exceptions and monitor for exploitation attempts

Evidence notes

The primary evidence for this vulnerability comes from the CVE record and NVD detail pages. The vulnerability affects the iCagenda extension for Joomla, allowing arbitrary file uploads that can lead to PHP code execution. Defenders should verify the affected product/version/scope from official sources and assess their exposure.

Official resources