# iCagenda (com_icagenda) below 4.0.8 - Unauthenticated Arbitrary File Upload (RCE) [Joomla Vulnerability Database](https://mysites.guru/vulnerabilities/)/CVE-2026-48939 CVE-2026-48939CriticalCVSS 10.0CVE published 20 June 2026Added to mySites.guru 15 June 2026 # iCagenda (com\_icagenda) below 4.0.8 - Unauthenticated Arbitrary File Upload (RCE) iCagenda's frontend "Submit an Event" form (index.php?option=com\_icagenda&task=submit.submit) accepts arbitrary file uploads with no server-side type check. The submitAccess access-level setting is enforced only in the view, not on the processing path, so a guest with a freely-harvested CSRF token can upload a .php web shell to a web-served, predictable path and execute it, effectively unauthenticated RCE. Confirmed exploited in the wild from 15 Jun 2026 (icagenda-batch/1.0 scanner). CVE-2026-48939, added to the CISA Known Exploited Vulnerabilities catalog on 10 Jul 2026. Fixed in 4.0.8 (JoomliC Critical Security Release, 15 Jun 2026); update immediately. If you cannot patch, rename the com\_icagenda component folders, since unpublishing does not close the hole. Copy citation ## Is my site affected? CVE-2026-48939 is checked by 2 rules. Find the extension and release line your site runs: Extension Affected versions Fixed in What to do [iCagenda](https://mysites.guru/vulnerabilities/icagenda/) from 4.0.0 up to but not including 4.0.8 4.0.8 Update iCagenda to 4.0.8 for this flaw, or to 4.0.12 or later, which no rule we check matches. [iCagenda](https://mysites.guru/vulnerabilities/icagenda/) from 3.2.1 up to but not including 3.9.15 3.9.15 Update iCagenda to 3.9.15 or later. [Check whether your sites are affected](https://mysites.guru/free-audit/) ## How CVE-2026-48939 is scored The base metrics as Joomla CNA published them, and what each one means for a site running an affected version. Threat and environmental metrics are left out: they describe a moment or a particular install rather than the flaw. 10.0 Critical CVSS 4.0, scored by Joomla CNA `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` ### How it is reached - **AV:N Attack vector** - Network. Reachable across the internet - **AC:L Attack complexity** - Low. Nothing to work around, it just works - **AT:N Attack requirements** - None. Works against any affected install - **PR:N Privileges required** - None. No account needed - **UI:N User interaction** - None. Nobody has to be tricked into anything ### What it does to the site - **VC:H Confidentiality** - High. Everything the site holds can be read - **VI:H Integrity** - High. Data and files can be altered at will - **VA:H Availability** - High. The site can be taken down ### What it does beyond the site - **SC:H Confidentiality** - High. Data on other systems can be read - **SI:H Integrity** - High. Other systems can be altered - **SA:H Availability** - High. Other systems can be taken down ## Timeline 1. 15 June 2026mySites.guru check added for iCagenda (from 4.0.0 up to but not including 4.0.8) 2. 15 June 2026mySites.guru check added for iCagenda (from 3.2.1 up to but not including 3.9.15) 3. 15 June 2026[We published: Zero Day Vulnerability Found in iCagenda Joomla Extension](https://mysites.guru/blog/icagenda-zero-day-file-upload-rce/) 4. 20 June 2026CVE-2026-48939 record published by its CNA ## Rule details Critical[CVE-2026-48939](https://mysites.guru/vulnerabilities/CVE-2026-48939/)2026-06-15 [iCagenda](https://mysites.guru/vulnerabilities/icagenda/) Affected versions: ≥ 4.0.0 and < 4.0.8 Full advisory: [www.cve.org](https://www.cve.org/CVERecord?id=CVE-2026-48939) Critical[CVE-2026-48939](https://mysites.guru/vulnerabilities/CVE-2026-48939/)2026-06-15 [iCagenda](https://mysites.guru/vulnerabilities/icagenda/) - iCagenda (com\_icagenda) below 4.0.8 - Unauthenticated Arbitrary File Upload (RCE) iCagenda's frontend "Submit an Event" form (index.php?option=com\_icagenda&task=submit.submit) accepts arbitrary file uploads with no server-side type check. The submitAccess access-level setting is enforced only in the view, not on the processing path, so a guest with a freely-harvested CSRF token can upload a .php web shell to a web-served, predictable path and execute it, effectively unauthenticated RCE. Confirmed exploited in the wild from 15 Jun 2026 (icagenda-batch/1.0 scanner). CVE-2026-48939, added to the CISA Known Exploited Vulnerabilities catalog on 10 Jul 2026. Fixed in 4.0.8 (JoomliC Critical Security Release, 15 Jun 2026); update immediately. If you cannot patch, rename the com\_icagenda component folders, since unpublishing does not close the hole. Affected versions: ≥ 3.2.1 and < 3.9.15 Full advisory: [our disclosure post](https://mysites.guru/blog/icagenda-zero-day-file-upload-rce/) ## Our disclosure post [![Zero Day Vulnerability Found in iCagenda Joomla Extension](https://mysites.guru/_astro/icagenda-zero-day-file-upload-rce.Bgl0hZH3_ZE0uaD.webp) ### Zero Day Vulnerability Found in iCagenda Joomla Extension mySites.guru found and confirmed an unauthenticated upload giving remote code execution on Joomla 6 sites running iCagenda. Fixed same-day in 4.0.8. 15 Jun 2026 ](https://mysites.guru/blog/icagenda-zero-day-file-upload-rce/) ## Other vulnerabilities in iCagenda Updating for CVE-2026-48939 alone can leave a site on a release another rule still matches. These are the other flaws we check for in the same extension. ### [iCagenda](https://mysites.guru/vulnerabilities/icagenda/) Latest safe version: 4.0.12 - [CVE-2026-67365](https://mysites.guru/vulnerabilities/CVE-2026-67365/) from 4.0.8 up to but not including 4.0.12 - [CVE-2026-71571](https://mysites.guru/vulnerabilities/CVE-2026-71571/) from 4.0.8 up to but not including 4.0.12 - [CVE-2026-67366](https://mysites.guru/vulnerabilities/CVE-2026-67366/) from 4.0.8 up to but not including 4.0.12 - [CVE-2026-71570](https://mysites.guru/vulnerabilities/CVE-2026-71570/) from 4.0.8 up to but not including 4.0.12 ## References - [CVE-2026-48939 on cve.org (the official CVE record)](https://www.cve.org/CVERecord?id=CVE-2026-48939) - [CVE-2026-48939 in the NIST National Vulnerability Database](https://nvd.nist.gov/vuln/detail/CVE-2026-48939) - [Zero Day Vulnerability Found in iCagenda Joomla Extension](https://mysites.guru/blog/icagenda-zero-day-file-upload-rce/) ## CVE-2026-48939 questions Show all Which versions are affected by CVE-2026-48939? [CVE-2026-48939](https://mysites.guru/vulnerabilities/CVE-2026-48939/) is covered by 2 rules: iCagenda from 4.0.0 up to but not including 4.0.8; iCagenda from 3.2.1 up to but not including 3.9.15. How do I fix CVE-2026-48939? It depends on the extension and release line your site runs. For iCagenda from 4.0.0 up to but not including 4.0.8: update iCagenda to 4.0.8 for this flaw, or to 4.0.12 or later, which no rule we check matches. For iCagenda from 3.2.1 up to but not including 3.9.15: update iCagenda to 3.9.15 or later. How severe is CVE-2026-48939? Joomla CNA scores it 10.0 (Critical) under CVSS 4.0. In plain terms: reachable across the internet, no account needed and nobody has to be tricked into anything. ## Running an affected version on a site you manage? A free audit tells you which of your Joomla and WordPress sites run an affected version, which are out of date, and which have not been backed up. No card required. If a site is already compromised, [fix.mysites.guru](https://fix.mysites.guru/) is a single fixed fee per incident, usually resolved the same day. This check is part of the [mySites.guru Joomla vulnerability scanner](https://mysites.guru/joomla-vulnerability-scanner/), which reads every installed extension's version on each audit. Browse the rest of the [Joomla vulnerability database](https://mysites.guru/vulnerabilities/). Rules current as of 14 October 2026.