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

In short

iCagenda iCagenda has a weakness classified as unrestricted upload of file with dangerous type (CWE-434). CISA added it to its Known Exploited Vulnerabilities catalog on 2026-07-10. NVD lists CVSS 4.0 at 10 CRITICAL.

What it is

“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.” — CISA KEV, retrieved 2026-11-01

“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.” — NVD, retrieved 2026-11-01

Who is affected

iCagenda iCagenda. NVD lists the following versions as affected:

• Versions from 3.2.1 inclusive, before 3.9.15
• Versions from 4.0.0 inclusive, before 4.0.8

Exploitation status

CISA KEV added: 2026-07-10. Known ransomware campaign use: Not reported by CISA. Due date CISA set for US federal civilian agencies: 2026-07-13.

Scores

NVD CVSS 4.0: 10 CRITICAL; vector 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:X/RE:X/U:Red; source [email protected].

EPSS by FIRST: 20.07%; percentile 97.45; score date 2026-10-31. EPSS estimates the probability of exploitation in the next 30 days.

CWE: CWE-434.

Timeline

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 KEV

What to do

• Confirm whether you run iCagenda iCagenda and which version.
• Apply the vendor update or mitigation in the vendor advisory.
• Follow CISA’s required action.
• Review the vendor guidance on signs of compromise.
• Track the fix through completion.

References

• Third Party Advisory: https://mysites.guru/blog/icagenda-zero-day-file-upload-rce/
• Release Notes: https://www.icagenda.com/docs/changelog/icagenda-3-9-15
• Release Notes: https://www.icagenda.com/docs/changelog/icagenda-4-0-8
• NVD detail
• CVE.org record
• CISA KEV catalog

Sources and dates

CISA Known Exploited Vulnerabilities Catalog, version 2026.10.30; retrieved 2026-11-01. CISA KEV data: CC0 1.0. No endorsement by CISA.

NVD retrieved: 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

EPSS scores by FIRST; score date 2026-10-31.