iCagenda Joomla extension: Stored cross-site scripting (XSS)
Summary
The iCagenda event management extension for Joomla (versions 3.2.1 to 4.0.16) contains a stored cross-site scripting flaw in the url-type event custom field. An attacker with low privileges and some user interaction can store malicious script that runs in the browser of other users, such as administrators or staff who view event data in the backend. The CVSS 4.0 base score is 8.6 (High), with high impact on confidentiality and integrity.
Affected
- iCagenda 3.2.1 to 4.0.16 (Joomla extension, icagenda.com)
- The CNA title mentions 4.0.8 to 4.0.12, but the product entry and the NVD description state 3.2.1 to 4.0.16.
Fixed in
- iCagenda 4.0.17 (Joomla 4, 5 and 6)
- iCagenda PRO 3.9.17 (Joomla 3)
- Unknown: whether a free Joomla 3 build contains the same fix.
Workaround
Unknown. No vendor workaround for this CVE has been found.
- Interim measure from a related iCagenda XSS (CVE-2026-75948): restrict frontend event submission to trusted user groups until a patched version is installed. This is not confirmed for CVE-2026-102790.
Exploitation
- Not known to be exploited in the wild (OffSeq). CISA KEV: not listed (Strix).
- No public proof of concept found in our searches. This does not prove that none exists.
- EPSS: 0.28 % (percentile 21).
Our recommendation
- Inventory all Joomla websites with iCagenda and confirm the installed version.
- Update to iCagenda 4.0.17 or, for Joomla 3, PRO 3.9.17. Confirm the free Joomla 3 position with the vendor.
- Check whether the public event submission form is enabled and restrict it to trusted user groups.
- Review event data for unexpected script content and monitor backend logins.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- iCagenda vendor website www.icagenda.com
- iCagenda changelog (vendor) www.icagenda.com
- JoomliC iCagenda download page www.joomlic.com
- Positive Technologies advisory PT-2026-127210 vulners.com
- Vulners CVE record CVE-2026-102790 vulners.com
- VulDB entry 427963 vuldb.com
- OffSeq threat radar entry radar.offseq.com
- Strix CVE entry www.strix.ai
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 06:56.
Original description (NVD)
Joomla Extension - icagenda.com - Stored XSS via url-type event Custom Field in iCagenda 3.2.1 to 4.0.16
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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