CVE-2026-48939 — Icagenda
CRITICALCVE-2026-48939 is a critical-severity (CVSS 9.8) Unrestricted File Upload vulnerability in joomlic icagenda. It is in CISA's Known Exploited Vulnerabilities catalog (added 2026-07-10) — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.
A vulnerability in the iCagenda extension for Joomla allows the upload of arbitrary files in the file attachment feature, ultimately resulting in PHP code upload and execution.
Exploitation Status
Actively exploited in the wild
- Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2026-07-10. Federal agencies were required to remediate by 2026-07-13.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2026-48939.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2026-48939 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 380,066 CVEs with a current EPSS score, this one falls in the 10–50% band (highlighted). Counts from FIRST.org, log-scaled.
Description
A vulnerability in the iCagenda extension for Joomla allows the upload of arbitrary files in the file attachment feature, ultimately resulting in PHP code upload and execution.
Affected Products
icagendajoomlicDetection & mitigation playbook
Vendor / applianceDetect
Inventory every joomlic icagenda deployment and check each version against the affected-products list above.
Fix
Apply the joomlic icagenda security patch or hotfix for CVE-2026-48939 on the affected version, following the vendor advisory for your exact build.
Workarounds
Treat uploaded files as untrusted until proven otherwise: validate the actual content type rather than the supplied extension, store uploads outside the web root on a volume mounted without execute permission, and rename them to server-generated identifiers so an attacker cannot choose the path a request will later resolve. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
How to detect CVE-2026-48939
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2026-48939 -u https://target- Template
- Joomla iCagenda < 3.9.10 - Unauthenticated Arbitrary File Upload RCE
- Severity
- critical
- Impact
- Attackers can upload and execute arbitrary PHP code, leading to full server compromise.
- Remediation
- Update to the latest version of iCagenda extension.
Template by ProjectDiscovery nuclei-templates (0x_Akoko), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2026-48939 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.