---
title: "CVE-2026-48939: iCagenda Unrestricted Upload of File with Dangerous Type Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-48939/
description: "CVE-2026-48939 (iCagenda iCagenda): Exploited in the wild (CISA KEV). A vulnerability in the iCagenda extension for Joomla allows the upload of arbitrary…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-20
date_modified: 2026-08-18
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-48939"
kev: true
cvss: 10
epss: 0.20069
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-48939: iCagenda Unrestricted Upload of File with Dangerous Type Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run iCagenda iCagenda. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-07-10, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-07-13 ; treat that as the outer limit, not the target.
- EPSS 20.1% , percentile 97: FIRST’s model estimates a 20.1% chance of exploitation activity in the next 30 days, higher than 97% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Editorial verdict: Check exposure. iCagenda CVE-2026-48939: Exploited Joomla Upload-to-RCE — Only Joomla 6.0.0-6.1.1 sites running iCagenda before 4.0.8 were open to web shells; those sites need a web-shell hunt, while everyone else on iCagenda simply updates.

## What it is

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 (CVE record)

- icagenda.com iCagenda extension for Joomla: 3.2.1-4.0.7

## Severity

- Joomla CVSS 4.0: 10 `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/AU:Y/U:Red`

## Exploitation

- CISA KEV: added 2026-07-10; federal due date 2026-07-13. Known ransomware use: Unknown.
- CISA required action: 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.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 20.07% probability of exploitation activity in the next 30 days; percentile 97.

## Sources

- [icagenda.com](https://www.icagenda.com/docs/changelog/icagenda-3-9-15)
- [icagenda.com](https://www.icagenda.com/docs/changelog/icagenda-4-0-8)
- [Listed in CISA KEV notes (icagenda.com)](https://www.icagenda.com/#download)
- [CVE.org record CVE-2026-48939](https://www.cve.org/CVERecord?id=CVE-2026-48939)
- [NVD entry CVE-2026-48939](https://nvd.nist.gov/vuln/detail/CVE-2026-48939)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-48939)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk)
- [icagenda.com](https://www.icagenda.com/)
- [mysites.guru](https://mysites.guru/blog/icagenda-zero-day-file-upload-rce/)
- [github.com](https://github.com/Polosss/By-Poloss..-..CVE-2026-48939)

---
Source page: https://erroneo.us/security/cve/CVE-2026-48939/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt