CVE-2026-48939 iCagenda for Joomla vulnerability
iCagenda contains an unrestricted upload of file with dangerous type vulnerability that allows the upload of arbitrary files in the file attachment feature, ultimately resulting in PHP code upload and execution.
Quick answer
iCagenda for Joomla should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- iCagenda 3.2.1 through 4.0.7
Fixed versions
- 4.0.8
- 3.9.15
How to fix it
CVE-2026-48939 affects the iCagenda extension for Joomla and allows unrestricted upload of dangerous file types through the file attachment feature. The impact is critical because exploitation can result in PHP upload and remote code execution, and CISA has listed this CVE as known exploited. Upgrade affected iCagenda 3.2.1 through 4.0.7 installations to iCagenda 4.0.8 or the 3.9.15 security release immediately. Until patched, disable public event submission attachments and block execution in upload directories.
- Inventory every Joomla site that uses iCagenda, including production, staging, backups restored online, and multisite deployments.
- Identify iCagenda versions 3.2.1 through 4.0.7 and prioritize internet-facing Joomla 6 sites and sites with public event submission enabled.
- Upgrade to iCagenda 4.0.8 or iCagenda 3.9.15 from the vendor security release channel.
- Disable or restrict frontend event submission attachments until the patched extension is deployed and verified.
- Harden upload directories so PHP and other server-executable files cannot execute from user-writable paths.
- Review web roots, media folders, temporary folders, and iCagenda attachment directories for unexpected PHP files, web shells, or recent uploads.
- If compromise is suspected, preserve evidence, remove malicious files, rotate Joomla administrator and hosting credentials, and rebuild from a trusted backup where integrity is uncertain.
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Verify the fix
- Confirm the Joomla extension manager reports iCagenda 4.0.8, 3.9.15, or a later supported security release.
- Confirm unauthenticated users cannot upload PHP or other executable files through iCagenda attachment workflows.
- Confirm web server rules prevent script execution from upload and attachment directories.
- Review logs and filesystem timestamps for exploitation attempts before and after patching.
- Document the iCagenda version, CISA KEV priority, upload-hardening evidence, and cleanup actions, then rerun Fixnx or the relevant vulnerability scan.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-48939?
iCagenda for Joomla versions listed as affected should be reviewed: iCagenda 3.2.1 through 4.0.7.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.