CVE-2026-48939
Description
CVE-2026-48939 is a critical RCE vulnerability in iCagenda for Joomla (CVSS 9.8) that is actively exploited and requires immediate patching.
CPE
| Product | Version Start | Version End (excl.) | Status |
|---|---|---|---|
| icagenda | 3.2.1 | 3.9.15 | vulnerable |
| icagenda | 4.0.0 | 4.0.8 | vulnerable |
Related weakness (CWE)
Remediation plan
Apply official patches
Download and install the latest security updates from the official iCagenda website or the Joomla Extension Directory to address the insecure file upload flaw.
Update affected systems
Ensure iCagenda is updated to version 3.9.15, 4.0.8, or higher, as versions 3.2.1 through 3.9.14 and 4.0.0 through 4.0.7 are confirmed to be vulnerable.
Restrict access
Implement strict file upload controls and consider disabling the file attachment feature if it is not business-critical. Use a Web Application Firewall (WAF) to filter and block suspicious POST requests targeting the extension's upload endpoints.
Monitor for exploitation
Review web server logs for unexpected PHP files within the iCagenda media or upload directories and check for unusual outbound network traffic originating from the Joomla server host.
Detection Guidance
"To detect exploitation of CVE-2026-48939, monitor web server access logs for POST requests to iCagenda upload components followed by immediate GET requests to newly created .php files in the /media/com_icagenda/ or /images/ directories. Use file integrity monitoring (FIM) to alert on unauthorized PHP file creation. Network signatures should look for common web shell patterns like eval() or base64_decode() within multipart/form-data payloads targeting the Joomla extension."